[rapind]

Invest in the people you have. If they don’t have the cycles then hire someone you can invest in. Ultimately if it’s temporary expertise that isn’t core to your business you can still contract it out.

This system is similar to what a co-op would use, and there are successful (and unsuccessful) co-ops.

[gravypod]

In some situations that's just not an option because once you've acquired the skill you now need to be paid for the skill in order for this system to be at all fair.

That's also not saying anything about the feasibility of turning the average engineer into, for example, a chrisseaton [0] in a few months.

The deal from the employer sounds bad: "Ok we need you to become an expert in X by Y to meet deadline Z. If you can't become an expert in X just do your best so we are able to hit deadline Z! Don't worry! You'll have a bunch of time in the future to maintain it!"

[0] - https://chrisseaton.com/