Literal translations can leave us short of understanding as you so ably demonstrate Blue. (I generally let your self-important remarks pass, but I thought I’d return one.)
The Church does not “establish” its practices, and then define belief or theology to fit. But rather we can be sure when we look back on practices, such as the liturgy of celebrations of the mass, we can be sure they reflect belief.
Pius XII addresses this in Mediator Dei. Here is a small extract:
*“The sacred liturgy, consequently, does not decide or determine independently and of itself what is of Catholic faith. etc.”.
Consider even your meat discipline. To skip meat on Fridays has a reason from the start - it was not established later.*
As I say Rau, if you cannot accept that praxis often precedes theology and gives rise to theology there is no common ground for rational discussion.
Even more so if you deny the reasonable Wiki explicitations of what LOLC means

.