I'm almost entirely sure that PS4 and XOne controllers did get upgrades at some points. Definitely Switch 1 ones, which matters or not depending on how you split the gens. There were definitely revisions in older controllers, though. Some were labeled and had obvious new features, some were quieter. And PC-side drivers got updates all the time, obviously.

Also, your current gen controller will also keep working indefinitely without an update. In this case Valve is annoyed about a particular dependency where THEY need the upgrade to happen for a feature compatibility thing, but the controller proper will work if you plug it in.