I will not respec since it will ruin the game imo.
The first playthrough will probably be the most fun since everything is new so I will choose carefully when creating my character. Whatever I'll play in a second playthrough will probably depend on what I encountered in my first playthrough, since I will then be better equipped to make a character who will fit into the universe in an interesting way. For instance not much fun in playing a druid if most of the action takes place in the city.
While I'm hoping that my PnP Arcane Trickster will be as enjoyable in BG3 as he is in my weekly D&D campaign, this is part of why I'm creating, and starting off with, multiple characters.
I too probably won't respec, but any given character, including my beloved AT, may not actually be as enjoyable in game as in my head... Meh, we'll see where things go. 🤷