Players and the game design's mindset has become increasingly individualistic

[Mikey_R]

I won't say the class design became more individualistic,
If anything,
The class design became less and less individualistic, which is evident by the awfully low amount of player skill expression. As player who main Class X will PROBABLY perform the same as another player who play the same class.

Player's role responsibility however,
their role didn't really become more nor less individualistic, just became different.

From "Do your best within what your own role can do to carry your team to victory"
to
"Do your best to follow step the of the best player of your role and victory will come to you naturally"

I really don't see what you are trying to convey here. Jobs have always had an optimal rotation, so nothing has changed in that regard.