Why don’t more job specs promote work-life balance

Whenever I get sent a job spec from a recruiter, it’s always the same format...

“Green field this.. wow!”,

“using technology a, b and c.. oh golly!”,

“The leading blah de blah company in the industry... !”

If just one job ad highlighted that a company promoted good work-life balance, flexible hours (as well as the above points), I’d be 100 times more keen to apply.

I don’t know if this makes me sound lazy, but that’s not where I’m coming from. It’s just that, if I knew a company truely had its employees well-being at heart, I’d really be so much more keen to work for them long term and put in great effort and passion, in exchange for flexibility and wellbeing.