Competition for the sake of competition isn't intrinsically a good thing.
Seems to me, most of the people complaining about Steam are greedy devs who want to make more money off of their products.
For me, as a user, that's not my concern. For me, as a user, it's more important that I can play games without having to download different launchers just to make someone else richer.
GOG is probably the only legitimate competitor with Steam. They provide value to customers instead of just themselves or greedy devs.