Whether it's subjective or not doesn't matter to the topic at hand.

The status quo is, you're not getting that information upfront. It would very much be useful for you to know before sinking in several hours of effort and accumulate stress, only to figure out it doesn't at all match your preferences and the remainder of the package doesn't make up for it.

It is also one of the few things that companies can do which won't increase costs when practiced properly. That's the whole point of the root comment, and it falls flat given most job ads are secretive about almost everything.

Sure, your life balance doesn't equal mine. That doesn't mean that either of us should be expected to work more or less. If you want to work more, get a second job or invest time into a structured hobby.

It doesn't generally depend on how creative/smart we are, nor even our outcomes with less work. You working on a task that is easy for you doesn't mean that I should work more and you should work less. It really just means that we can expect different things from you than me, which is realistic so long as they aren't vastly different on the same task.

Work-life balance doesn't really depend on anything the company does other than having policies that allow for it and then actually following through.