I would much rather have another ACT, like Act 4, then worry about a few classes and races missing. Content over Race/Class, any day.
I completely agree, the breadth and depth of game content is most important.
DnD started with just Fighter, Cleric & Wizard; with Thief added by the second printing. What made DnD interesting then was the very distinct nature of each class, leading to the need for a full party to tackle a typical DnD adventure; but that has been consistently diluted.
There are now so many classes, subclasses, races and other options for tailoring a character, that you might as well not have a class system at all.
In fact, I have always preferred games that allowed you to choose your development direction freely, and this also has the advantage that it removes the endless ( and pointless ) arguments about "balancing" between classes.
