Shadowedeyes
Adventurer
The problem with more classes is that they become increasingly more niche. And of course there are going to be people who like those niche classes, but are there enough people interested in playing them to make it worth making? That is the question WotC I'm guessing is asking themselves, and outside of the Artificer, I would guess the conclusion is no. And we know broad classes are popular. Fighter keeps popping up high in the D&D Beyond statistics, and I would hazard a guess it is because it encompasses a lot of different concepts.