I think when it was announced, there were some leaks that said these Game Key Cards would be the Switch 1 version of the game, along with a code to upgrade to the Switch 2 version. This would basically prevent you from selling it again. This was quickly refuted, but people still like to shit on Nintendo, so they don't care.
Then you also have people complaining that games on other consoles don't come with the game (not even pre-patch version or something) anymore, like Doom: The Dark Ages, just a few MB of data for authentication or something and the rest you have to download. Switch now does basically the same, and it "only" has 256GB storage, plus the microSD Express card. But the games are also smaller, so I don't know if it's like you can only fit a few big titles on there (or one Call of Duty), and then you're outta space.
The only thing I know is that access to the specific purchase might get blocked, if there's a payment issue. Not Steam directly, but a friend of mine once bought Diablo 3 for WoW gold on Battle.net, something happened after a while, and he lost access to the game, dunno if the other side refunded the game or whatever. All the other games still worked, but he'd have to buy D3 again to play it. I would be surprised if Steam blocks the whole account.
If they mean you buy a game, then there's a problem with payment, but they should still let you download and play, that's dumb.
The part about Steam Support being extremely slow is also old news. I think that's been a lot better for years now. I don't know if it was around the time they were forced to implement refunds, but I think that's all outsourced now, and you don't have to hope a Valve dev checks the support mailbox anymore.