I'd say that, if the employer doesn't cover a need with a full-time employee working a healthy amount of time, he/she should hire another employee, full or partial time.

Thus, unemployment is reduced, more money is put into the economy and the full automation apocalypse is delayed for a little bit. And if another employee can't be paid, then that business is not really viable and should close.

And for anyone expecting shorter working hours to lead to the apocalypse: They should consider that France, the canonical UK example of "too strict" working time restrictions, for the vast majority of the last 50 years or so have had a higher GDP per capita than the UK (their GDP per capita was lower for a few recent years, but then they overtook again).

If you actually believe this, count yourself lucky to be so privileged. Given all the shit I've heard from HR people over the years, it is a hopelessly naive viewpoint.