The Meaning Of Characters and Classes?

If the goal of this game is just cleaning map quickly and high profite.
no matter how many character/class GGG designed, player will find the most suitable to do it (usually a sorceress with high damage AOE).

so what's the meaning of other character/classes? nobody will build a shield soldier which can take a lot of damage but clean a map with 10min.

everybody is trying to become a glass cannon instead of a steel tank.

look what happened to Titans, they become cowards hiding behind Totems.

how about make some bosses which will need a team to kill it?
how about make some Time-Survive mode which doesn't need player attack but suivive the damage?

GGG stop introducing Druid to players. just look the abilities and skills showed in trailer, they're too slow/weak to clean the map, nobody will play them.

So, the problem is which builds are suitable. It's about balance. And no, a warrior can't take damage as well as I want (it's not about bosses).
There is no way for real team play because of the mess on the screen. Every character should be able to complete all content on their own. So there is no place for teams.

I think there is a way out of "massive AoE", but it needs a lot of changes:
- rarity
- quantity of mobs
- size of maps
- damage balance
- movement speed balance
And so on...

To have fun. I don't care what trade leaguers who treat the game like a job do. I profit enough from my work.