Seriously I'm laughing with this "4 is standard". There are not many more cRPG with party of 4 than with party of 5 or 6.
This is a very bad argument.
Anyway I don't have to read all this thread to inox that I fully agree with OP.
Give us a party of 6 please ! (Or at least 5...)
Four became the standard due to the growth of console gaming. There’s absolutely no other reason to reduce party size.
Six should be the standard for a D&D game. It’s the good sweet spot of being able to fulfill all party needs while providing flexibility of class choice.