PS4 and Xbox One exclusive titles aren't that impressive

[Chazore]

caffeinade said:

PCs don't really need the ability to artificially create exclusive titles.
If you want to build something that does interesting things, you kind of need to build it for PCs anyway.

Valve's outward viewpoint on exclusives isn't positive, in their favor of them.
Meaning Valve doesn't like the general idea of the practice.
Valve also apparently strongly dislikes working in closed environments (consoles and mobile phones).

If you want, I can find some quotes in a bit.
Gabe seems to be very passionate about this topic.

Which is why we see watered down versions being released, so the part of needing to build a rig for it eventually becomes redundant.

Valve isn't exactly positive about them, yet their own titles are exclusive to Steam. You can play them on other OS's for example, but only if you're using Steam, so they are half and half with and against exclusivity.