My experience is that most people at Mass on Sunday haven't a clue what is going on. In one Church I attended a group of women nearby were engaged in conversation through tha Mass. Almost all the congregation received Communion when time-slots allotted to Confession could not possibly have accommodated all of them. Without being judgemental, I find it difficult to believe that no one in the whole congregation at a Sunday Mass was in a state of grace. In my day mortal sinners refrained from receiving the Eucharist and in those days we were well aware of what constituted a mortal sin.
Members of my non-immediate family, educated in Catholic schools yet never normally go to Mass have no compunction about receiving Communion during 'Rites of Passage' Masses.
Formal liturgical prayers in one's own language might as well be in Old Church Slavonic insofar as they engage the mind.