No one is bothered that child processes do most of the work.
I've been known to gob on Lord Londonderry's statue in Durham. (Not recently, for obvious reasons) Amongst many other bits of bumholery he opposed the banning of child labour on account of it being more expensive to build adult sized tunnels in his mines.
The thing that I hate about this particular trend is that people are objecting to new metaphors because the origin of the metaphor is objectionable.
That, though, is precisely what makes them memorable, useful, and a permanent if obscure reminder that that origin was a bad thing. It's a form of cultural appropriation that I very much approve of in the hope that the bad origin will become obscure enough to not be the first thing that is thought of in usage. I don't literally support the tearing of flesh whence comes sarcasm, the forced euthanasia of sardony, or open street slaughter and butchery implicit in a shambles. Nailing ears to pillories is perfectly fine, however, as it's a wonderfully elegant way of having optional early release.
The kind of friendly world _I_ want to live in is one where future generations are surprised and shocked to find that the word slave was ever applied to humans. Attempts to force us exclusively to do so should be actively discouraged.