Yeah, it is too small for several reasons and under several metrics, but we already discussed all this what feels like a million times.
It's not really a matter of difficulty, either. It's just that a 4-men cap feels awfully restrictive in a big ass CRPG where you'd hope to meet new characters left and right, try different compositions, experience as many companions sidequest at once as possible, etc.
There is so little identity to classes.
That's mostly a problem tied to playing with low level characters capped at 4.
That aside, class variety is just part of the discourse here.