I bought a new racing wheel a while ago and it wasn't quite working on linux, after doing some searching I found that a Valve employee was working on a patch to the kernel to fix this racing wheel just to make gaming on linux better.
They're standing on the shoulders of Giants, but I also don't see (m)any of the other stores doing likewise.
It doesn't need 'good commercial titles', it needs to be seen as the preferred option for supporting Indies over steam (i.e. if you are presented with the choice, go for itch. If you're already on steam then steam has earned its money).
On the other hand, if you're someone who is frustrated with the commercial nature of current stores and are pining for the simpler times - itch is very much going to scratch that... Itch.
I personally end up mostly on Steam, but on the occasion that I've really wanted to support a developer (usually puzzle games like Patrick's Parabox) I'll go to itch. The bundle for Ukraine recently also had some excellent finds in there.
tl; dr - if you are an indie connoisseur then yes, if you just want to game then probably not.
That's really the trick. Valve is targeting "whales" in the same way that mobile games are. Just not as blatently.
CS:GO and the attached gambling economy regularly goes on to destroy wallets of parents and others at risk of gambling behavior.
Valve certainly isn't a saint, but when it comes to steam, it's a decent platform that gets the job done and doesn't get in your way, no dark patterns there.