There is alot of content where DPS doesn't matter much.

But there is also content where it matters.

For these kind of content there should be the possibility of providing numbers ingame, so that its not PC only any longer.

There are some people that think "You just need to read and understand the skills".

People like this would be very surprised to see, how far they are away from performing very good. Maybe it would open their eyes, if they would "know" how wrong they are with their opinion.

Its more than just understand how the skills work. Its pure mathematics. And for this, you need numbers.