Well, considering Dark Age of Camelot was able to balance about 46 classes (and each of 3 factions having different classes to choose from), I'm not tooo worried about them balancing 21. 5-10 classes is the definition of LAMESAUCE,
I don't want to see everyone walking around with the same few classes. When you add a ton of classes, and even do a halfway decent job at balancing them, you WILL see a large variety of classes. I can't remember any classes in DAoC that were significantly underplayed tbh. Everyone played a good mix.
I guess so. I'm not familiar with DAoC, but if you say it can be done, I have no problems with 21+ classes. And since we know little to nothing about the character development system, we will all have to wait and see if it is possible.
I would also hope that the classes are distinct enough from one another to mean something, which is why I'm hesitant about 21+ classes. If the difference between class "A" and class "B" is one skill or perk, I say there is too much redundancy.
Maximizing variation, minimizing redundancy, and balancing team roles. This is my hope.