I pay for my games, but I just want to be able to play them how and when I want to play them.
If I buy two different physical games or two different online games directly from their publisher, I can load both at the same time on the same computer, or separately on two computers/devices, etc., but not with Steam.
Even companies like Netflix allow multiple devices (and families) to share one account. That way you can watch Netflix on one TV, your spouse on another, each of your kids on their own devices, etc.
With Steam, even if you pay full price for multiple games you still can only play one at a time even if you bought some of them for family members to play.
Steam offers a complex sharing system where you need multiple accounts and along with the hassle of going through all of those headaches just to play two different games you paid for on two devices at the same time.