Yes, of course I'd be perfectly comfortable if the CK were available without need for the Bethesda.net launcher. That doesn't mean I'd rather have it on Steam though. I'd prefer that it be an independent download from their website like the old days with Oblivion. Since they're not going to do that again, I'll settle for using their launcher because it's not a burden on me when I need to use the SSE/FO4 CK.
I'm in the CK far more often than I am in the game these days, which I think is normal for most dedicated modders. Steam doesn't represent enough of an inconvenience for me to worry about needing to start it up for a game session. Though again, if it didn't use Steam, I'd be thrilled because I'd be able to throw that monstrosity away for good. I've had my fill of Civ 5 and Civ 6 sucks balls so I don't ever run Steam for anything besides Skyrim and Fallout 4 now. Pretty much everything else I have is available on GoG - where the client isn't even necessary to play the games.