Why does Microsoft xbox scorpio need exclusives when the top best selling games are multiplatform?

[aLkaLiNE]

Snoopy said:

aLkaLiNE said:
It needs exclusives to define itself as a console. As it stands, someone could build a gaming PC and miss absolutely nothing from Scorpio.

But most people don't game on a PC. People can build a powerful pc right now and play all the best selling games on xbox one and ps4 significantly better in graphics and fps.

Then why has playstation dominated 3 out of 4 gens? According to the Internet, it has the inferior network and controller so it can't be those reasons.