For example you place the burden of “learning new things” at the feet of the employer, but you don’t really justify that. Why, in a general sense, can people not learn on the remaining hours of the day?
Your comment is riddled with moral presumption and I think it’s worth figuring out what those are.
But yeah, I think there are many books on spaced repetition and deliberate practice such that it's hardly a secret.
Besides, does everyone have a right to every single one of those things you've listed all the time? I wouldn't argue so, considering we're talking about people who are providing less value over time to their fellow human being.
When time conflicts exist, you must prioritize, and I would imagine "remain able to contribute meaningfully to society" (with caveats around capability) ends up being more important than, "maintain multiple hobbies".
And no, I don't think people are, generally, perfectly optimizing their time.
If you did indeed live in such a world, would your opinion change? If people did indeed have ~30 minutes a few times a week to keep up with their field's growth (and that's all it took), would that matter to you?
Trying to find the theoretical line for you.
I'm not sure where you're getting those things, these aren't "either/or" suggestions, but "both/and".