The Critical Role cast isn’t just leveraging acting chops to maintain better pacing. They are putting on a performance. It’s just not the same activity as playing D&D casually, the same as dancing at the club is a different activity than doing an improvised dance performance for an audience. The point of making this distinction, as stated in the opening post and reiterated many times in this thread, is to recognize the incredible skill that goes into making their performance look as natural as if it were a home game, and to emphasize that if you want to emulate them, you should keep in mind that their performance has different needs and concerns than your home game, so you might need to make some changes to adapt to the needs of your game.
What does it mean to you to say "they are putting on a performance"? You keep saying that like it has some bigger meaning than how I, or my players, put on a performance when we get into role playing. Are you saying they're performing when they're engaged in chit-chat, making references to pop songs or movies? To me putting on a performance means pre-planning, discussing story arcs that will be entertaining and so on. Not scripted per se but definitely planned out ahead of time.
No one is denying that they are very charismatic, something that is enhanced by their acting skills. I don't know what anyone else thinks, but I make no claims that I or my group is as charismatic and polished as they are. No one is denying that they've done tremendous work promoting and building a small business empire.