basically everyone can sell their games on Steam (*conditions apply)
it has a (working) offline mode
they’re putting a lot of effort into gaming on Linux
family sharing
it let’s me integrate external games
The Blizzard launcher is just for the few games Blizzard is selling. It asked me to go online way too often. Maybe every single time, I don’t remember exactly. It’s a bit like that Rockstar launcher. I don’t see any value in it besides auto updates.