I’ll chime in here because this is just plain wrong. I was raised speaking Visayan and somehow learned Latin as an altar boy while still in the Philippines. When I came to the US as a very young man, I learned English, as you say it by heart and I think I did pretty well in doing so.
My Mother had about a fourth grade education and my Grandmother less than that. Yet somehow these two relatively uneducated women both learned,. actually knew and understood what was being said in the Mass and more than that, actively prayed it along with the Priest as well as maintaining numerous outside devotions.
By your analogy, neither my Grandmother, Mother or I should be have been able to do it, yet we all did.
The truth my old friend Thistle is that if someone wants to learn something they will, and if they don’t they won’t. Very very few people are incapable of doing so. A lot don’t want to, but vety few are incapable.
I saw a statement in a biography I read a while back and it made a lot of sense to me. In it the writer, a fairly liberal Priest in Philadelphia was recounting his younger days when everyone was ecstatic over the vernacular being introduced into the Mass. The Priest tells some people that now everyone will understand the Mass as it will be said in their own languages.:
The people he was speaking to, an older German couple told him in reply:
IF PEOPLE WILL NOT LEARN WHAT ANGUS DEI MEANS WHAT MAKES YOU THINK THEY WILL LEARN WHAT LAMB OF GOD MEANS?
Think about it for a while.