What evidence is there for that?

Maybe compared to ones that don’t toss mid and late career professionals out like a bag of moldy peaches when some confluence of economical and technological factors makes them inconvenient, no matter if they’ve got kids, or a cancer diagnosis, are supporting lots of relatives, or anything else like that, and then say it’s their fault for not predicting it. Maybe ones that don’t financially ruin people because the hospital they got driven to while unconscious doesn’t take their insurance? That is, if they have it because the insurance that costs more than local mortgages for many? Maybe the places that sentence someone involved in a bank heist orders of magnitude longer sentences than white collar criminals that stole orders of magnitude more money?

Compared to one that pays well and treats people humanely.

It's not like that in order to suggest that something is bad there must be an existing better version. The suggestion can be about creating that better version.

That of course is a general answer to your asking for a comparison, as if lack of one would refute the point.

Some country first abolished child labour, even when all others still had it. Where the people who advocated for that misguided, since they didn't have a better example to "compare" to?

These are of course also concrete answers to your question, like many EU countries where the vacation period is one month, where there are better employee protections, where there is less discrimination, where overtime is frowned upon and the work culture is not the US "grind", where waiters don't have to make do on tipping, and so on.

They don't have to be perfect in everything either (because an easy knee jerk critique would immediately point to some other shortcomings in their work arrangements). For the point of the suggestion, it's enough that they have better aspects than some country like the US could also adopt.