This is interesting, personally I prefer playing a Wizard because there are so many Intelligence checks in the game - it really opens a lot of doors and allows you to win a lot of proficiency stuff - which leads to a lot of additional powerful stuff/abilities - without "save scumming".
Although so far it feels like Evocation is the only really powerful subclass of the wizard classes.
Then again, the entire game needs work, bugfixes and balancing so we will have to wait to see what Larian comes up with over the next 6 months to a year.
No there actually arent. Theres maybe at most 10% of the intelligence checks as there are CHA ones, and none of them are ever important.
Literally the main reason no one wants to play a Wizard is because yes INT is a useless stat.
