> There's this belief that being available 24/7 is a positive attribute in employees and we really need to squash that. It's unhealthy for everyone.
For whatever reason, employers seem to value this for certain roles, and they often pay a premium for it. This is a Good Thing for people who value money over flexibility; why lock them out of a natural fit? Perhaps you would argue that this isn't good for them, but surely they should be free to make the choice? For those who value flexibility over money, they shouldn't take those jobs. As long as expectations are communicated, there shouldn't be a problem.
Maybe this isn't a real problem, but I want to address it just in case: I'm concerned that some people may feel entitled to a high low-flexibility salary _and_ high flexibility. This sort of entitlement comes up often, and as far as I can tell, it fundamentally ignores economic realities. In other words, if these things are compatible, then proponents need to explain themselves (and provide a lot of support for their arguments) because it's far from obvious.