That approval thing is interesting, for sure. It reminds me of how experts are very deliberate in narrating their thinking for juniors while they work, so juniors can learn the why behind the how.

There are definitely companies that are being short-sighted on this. I've seen this come back and bite them (usually, not always).

I'd argue that if the company doesn't provide this, then people should rely on their community. I'm lucky enough to live in a place that has lots of meetups and we talk about this. Absent that, there are plenty of active discussions online, as this very thread shows.

The bonus of working via the community is that's where you can find a new opportunity if the company doesn't take care of their people.