[nani8ot]

A better Linux desktop experience means it's more viable as a daily driver, which makes it more likely to be used for gaming instead of Windows.

Valve wants independence from Microsoft Windows, a better Linux desktop is part of that.

[cromka]

It's also possible they'd strike a deal and sell the software via Steam platform. I don't see why would developers object that, after all it would be a new market for then previously out of reach. Doubt Microsoft would agree, but smaller devs for sure.