Maximum Bert said:
I would say give it another try and keep an open mind. Most of the problems you list are problems with modern PC gaming (and even somewhat distant past PC gaming) rather than just steam.
The account issue is true, but you really only have to sign in once, then you can set steam to remember your credentials and its really just 1 extra button click to access your games. This still works even if you don't have it to start up on boot (which is something I would never recommend for any program).
Steam also has an offline mode. You simply have to be online to get the game and do any updates. I believe GOG uses a similar model where you have to download the game then you never need to go online again.
As for the performance issue, I would suggest you try again. I don't know what laptop you're using or when you tried it, but steam doesn't have too big an impact. For reference my laptop was like $500 at bestbuy 2 years ago and I don't notice any performance drops.
The fact that they could take all your games away, I total agree with, but I feel that's not exactly a problem with steam, but more with modern gaming in general. Nowadays with most games having an online component, companies can almost remotely shut off the whole or at least a significant portion of the game. Going back to GOG, it is possible too that they do the same thing as well. Envision a scenario where they don't meet profit margins and have to shut down. What happens to all the games you purchased? In all likelihood you would probably have a small window of time to download as many as possible before they become permanently unavailable. I believe steam said at one point they would do the same sort of thing, where they would open up all the games in your account for download, but that may have been a rumor as I didn't read an original credible source on that.