I used to have a group I'd play DnD with, it was fun. We don't talk anymore though because they are right-wing assholes and would never accept me as a trans girl, since they openly made fun of transgender people. There was an NPC character in one of our campaigns which was a "man dressed as a woman" who would always get mocked for it.
It's absolutely mental to create a character to just act as a punching bag for your beliefs. Even if the roles were reversed, I doubt I'd enjoy playing with people like that.
I think the problem is that it's something not actually bad. Making a BBEG that's just a punching bag for your believe that murder is wrong is perfectly okay.
It always felt uncomfortable when they'd do it. I felt unsafe when they would do it. I bet if they saw me now they'd make those same jokes about me directly. Probably also mock me for pronouns. They weren't good people, I don't know why I hung out with them as much as I did. I guess I just wanted to feel like I fit in with others. Well I'm glad I never came out to them even when I found out, that would've been really bad for me, instead we just quietly went our separate ways.
I have one group I play in where there are 7-10 Players. It's pure chaos, though since we play very infrequently and a lot of the players don't take the game too seriously it somehow works out.
Still would not recommend unless you like roleplaying with your fellow players until you get to your turn of GM attention.
There was a fair deal of "rules of order" style rules in early D&D.
Ever hear of a "caller"? That was the special player in early D&D rules who got the privilege of telling the DM what the party would do. It did kind of help with big groups, actually.
I think you could do 8 if everyone is experienced and it's a combat only module. Everyone pre rolls, announces their turn, and quickly moves their mini. Even one person not being experienced in their role screws it all up.