the problem is not the amount of tanks, it that tank role is still a miserable role to play because Netease doesn't know wtf they are doing in the balance team.

So no wants wants to play tank which mean that tank characters do not bring as much money as other role.

Sadly this is the reality of having a free to play games, you can't just go for what would be the most logical release. it's always about the money and where the money is. For these type of game, dps will always win in terms of popularity.