Honestly, if you can avoid it I suggest doing so.
The problem really isnt with Steam as much as it is with the negatives of digital distribution.
Here it is.. in Black and white... Or well Red and Blue respectively.
This is how steam views how your spending your money through them. Note in red it is "Licenses and subscriptions" Not titles , Not games owned. In blue it claims "acquisition method" which is because they will not call it a purchase because purchase implies you own something. If you do it, do it knowing that crucial fact that at the companies discretion they can void and remove your account without remuneration on anything you purchase.
So yes, Avoid it where you can and when you can because.....
"The game is a lie"