I don’t think so. Missing everything after the communion rite isn’t essential to having attended Mass. Missing the entire Liturgy of the Word, or even worse, missing the Canon of the Mass (Eucharistic Prayer) would be another story.And I’ve never understood this thing of “leaving right after communion”. You can stay the entire hour to receive, but you can’t manage that last 10 minutes?
Don’t get me wrong. I’m not condoning missing any of the Mass whatsoever. Absolutely, strictly speaking, once the priest has said “the Mass has ended, go in peace”, Mass is over and you could leave that very minute. In fact, when I first became a Catholic, I reasoned, “well, it’s over, it’s OK to leave”, and I did precisely that. It does speed things along and lets you avoid the scrum that takes place when everyone else leaves at the same time. Then I realized, first of all, that you need to stay after Mass to make a proper thanksgiving (doesn’t have to be that long), and secondly, to leave while the priest is processing, or while the recessional is still playing, may not violate the letter of the law, but arguably, it violates the spirit.