I'm all for reimagining the email system, but considering how wide spread email is right now I think the replacement might need to be at least partially compatible to allow interoperation during transition
The tech industry’s ‘reenvisioning’ of a free/cheap older, but universal, standard is usually to replace it with something expensive, proprietary, and limited in scope.
That's an extremely broad question. Are you asking specifically about email replacements, communication standards, or just proprietary software in general?
When has ever a “tech industry’s ‘reenvisioning’ of a free/cheap older, but universal, standard” resulted in “an open and free standard” and not “the usual bullshit vendor lock in”?
Never that I can think of, which is why I stated my hope that it wouldn't be like that. But maybe that just means we can't necessarily depend on a profit motivated corporation to do the 'reenvisioning'