The language has absolutely no bearing on the liturgical elements and efficacy.
There is nothing inherently “problematic” if people do not understand every single word of a liturgy, you are right. However, I am not talking about inadvertently missing a word here or there during the litrugy, but people going to a TLM and having no clue what any of the words mean, while the ‘reverence’ and ‘tradition’ alone lifts their hearts up to God more than perfectly understanding every word of the liturgies in an OF Mass. It would be analogous to having someone’s heart being lifted up during the chant of a Psalm during the Liturgy of the Word solely because of the chant and not the words; does the chant help, of course! But, if you leave out the context and the meaning of words of the Psalm, what’s the point?
In Christian tradition [liturgy] means the participation of the People of God in the "work of God. Through the liturgy Christ, our redeemer and high priest, continues the work of redemption in, with, and through his Church. - CCC 1069