Earlier quoted context omitted.
The endless spigot of cash from Steam is something that does enable Valve to take some very experimental leaps (VR, Steam machines, SteamOS, etc.) In my opinion, Valve also has the same shortcomings as google: practically zero customer support, and an un-curated app platform full of shovelware (finding gems on the Steam and the Google Play & Chrome Web Stores can be tricky). But there is still a ton to admire in both…
You don't use steam to find gems. Steam is just where you go to buy them.
Steam is also constantly promoting new games to you and making suggestions based on what you currently play. There is also the social aspect in that you can see who is playing what, leading to new discoveries.