Same on all accounts. If I found a tool or system that increases my productivity by 50% what incentive do I have to pass those gains on to leadership?

Because they'll figure it out eventually. While I can't predict the future, I think it's naive to think that as all this catches on and becomes more commonplace that those of us that still have jobs won't be expected to work the same hours with much greater output. So I'd say enjoy it for now as it might not last. Like, computers in general were supposed to do this for us ~30 years ago.

Publicly- and private equity-owned companies will say "Thanks for automating yourself out of a job" and fire you.

Which is why you should always work for an employee-owned co-op where you share in profits from productivity gains.