>Are those people cutting the grass/operating the elevators happier/unhappier than they would be otherwise?

There are numerous studies that show menial labor leads to poor mental health. Perhaps these people employed as makework automatons are happier than they would be if they had no employment whatsoever and were destitute on the street, but these are not the only two alternatives.

>I'll ignore the glazier example as it seems quite extreme, and also comes with more obvious/specific "victims"

The "victims" at the Taj Mahal/department store are the visitors/customers who have to pay slightly higher prices as a result. While not as extreme as the glazier in the broken window fallacy, the grass cutters/elevator operators exist on the exact same spectrum.