What was the reasoning behind moving the Tabernacle from behind the altar to other parts of the Church?I know this occurred post VII.
When I’ve asked about it I was told (by a Monsignor, who was a bit pained trying to explain what HE’D been told) that moving the tabernacle solved the
“confusing duality” that “detracted” from the
“action of the altar” in the Sacrifice of the Mass.
And this was about the BEST (done for a “positive reason” one could explain)
thing I’d heard. Paraphrasing the intent: “since Jesus was already present,” per the Eucharist in the tabernacle denoted by the red sanctuary light - the sacrifice of the Mass was (theoretically) diminished or something*. < I put it this way because I could not agree with that – at the time (when the change(s) was/were first made) I’d gone to mass all my life and had never been fuzzy on the concept, confused, or conflicted by the traditional placement of the “front and center” tabernacle. Nor known anyone else who voiced the “problem”.
Per the “duality” explanation … didn’t Jesus’ whole Eucharistic teaching risk that?
When He said “This is my body,” while calling their attention to what looked like bread,
none of the apostles jumped up confused and complained …
“Hey … you’re confusing us with this duality. Could you go and leave your other bodyI***** or stay and maybe not give us this “confusing” teaching of “eat your flesh”? Last time you alluded to this you lost most of your disciples - and confused us to no end!”
*****
(like He later DID at Emmaus).
I had heard that precedent for this had been set per some Cathedrals (which many visitors came to, many non-Catholic, to view the art, etc. and so might unintentionally profane the sacredness of the Church with the Eucharist present) – so the Sacrament was (sometimes? all the time?) reserved in side chapels so that the devout could worship in the presence of the Eucharist without the distraction of tourists, etc.
There probably wasn’t even a tabernacle handy at the Last Supper for the unconsumed Eucharist to be reserved in. AND that first mass had no tabernacle behind Jesus. But very early on reserving the Eucharist was done, and Tarcisius, a young Christian martyr of 12 died protecting the reserved Eucharist he was smuggling to Christians condemned to die in Rome.
In the Catholic Churches of my youth (and young adulthood and not so young adulthood) the centrally located immediately visible tabernacle and Eucharist made the house of the Lord (upon entering) instantly holy - and one blessed oneself with holy water and genuflected toward Our Lord reserved in the sacrament. Catholic Churches were ***different from others ***in this way.
Another rationale for the change might be “making investigating Protestants feel more comfortable”? It may have been an outreach to “other Christians” to change such things as culturally (not doctrinally) could be changed to make “conversions” to Catholicism a less extreme change for some.
Mass in the vernacular (versus worldwide unity per the Latin Mass), the integration of familiar, non-contradictory Protestant hymns, and a gradual phase out or reduction in certain “Catholic” things like bells, incense, processions, stained glass windows, altar rails, genuflections, altar boys, etc. MAY have been with “outreach for conversions” in mind. With the side effects being? < (I see some but won’t address these now).
Yours is quite a good question. Sorry to answer with what might be (just honestly reported) hearsay and speculation. Maybe someone else has a link that more fully answers or explains the rationale for the change(s).
The arbitrary moving of tabernacles has been critiqued quite strongly in some quarters (notably by Mother Angelica and others on EWTN) – and some Churches have, after a time, moved them BACK to their “traditional position”. So the “alleviation of confusion” motive – seems to have had its counter-dilemmas.
I found the looking for the tabernacle (to genuflect toward upon entering the Church as I’d always done)
MORE confusing when it is moved QUITE far and camouflaged like “Where’s Waldo?” And during the “Holy, Holy Holy” of the Mass (recalling heavenly worship and prior to the Consecration) I felt uncomfortable when the tabernacle with Jesus present was then in an area I couldn’t even glance toward. It is HE we address in the prayer, no?
Children raised never having known a centrally placed Eucharist do not enter the church with a genuflection of worship. Why, and where to? Churches that are NOT great Cathedrals with the “problem” of tourists’ accidental profaning of a holy place - nonetheless move their tabernacles (quite radically too sometimes). Priests who once bowed in the common direction of the altar and the tabernacle (Eucharist) now confuse us in the priority of bowing to an empty altar (a holy place with Jesus not - yet or anymore present) and not toward the tabernacle (where the Lord IS) at all!
Usually when I mention my observations (and preference for a centrally located tabernacle), some get offended.

Or get defensive. Or act as though I’m disturbing the peace or something.
But those who made that initial decision may have not vetted the consequences well.
The move had the side effect of some saying things like " … they’ve cast the Eucharist aside (or behind)!" or “Some theologians don’t believe in the old idea of the true presence in the Eucharist anymore.” The first case just looks bad … the second case (it’s usually true somewhere that some believe errors) is an idea too serious not to try to rectify (IMO).
Notwithstanding that we should make potential converts feel as comfortable “as possible” in our Churches.
