Nope, they did NOT make all saves character exclusive. They switched to using just 1 profile, named "public". Further more they tagged all saves with a character name, but auto-saves, as well as quick-saves will be overwritten. (quite a mess if you ask me!!)

BTW. Mods are stored in C:\Users\xxxxxxxx\AppData\Local\Larian Studios\Baldur's Gate 3\Mods