Alexander wanted to fulfill a wish for Diogenes and asked him what he desired. Diogenes replied, "Stand out of my light."
Don't know if I agree. I remember having to turn it off a lot in the early days - but that was ~20 years ago. I will grant that unlike a lot of software it hasn't bloated too much in the intervening years, while hardware has gotten a lot faster.
Especially on older PC's. It noticeably slows down the start up, does eat a lot of ram. It's definitely noticable on a friend's 2014 laptop with 8GB ram and a slower SSD.
On my gaming PC I went into the Windows 10 Task Scheduler and added a task to run "steam.exe -silent" when the machine is idle for 10 minutes. That way it doesn't slow down booting but it does eventually get around to the updates if I fire it up and walk away.
Second would be Microsoft’s Store. On Apple it would be the other way around: Apple Store over Steam store. But aside of the native OS “store”, steam is the only 3rd party store I allow on my PC.
Early in it's life it was not known as a lightweight application, I'm pretty sure it gave Java a bad reputation for Desktop apps.