I can sort of understand the argument against reduced loads in the ten. if you buy a ten, you probably bought it for full power, not a bunch of play time. If you wanted mid power loads, maybe another would have been a better choice.
In my way of thinking, unless that pistol is going to be a carry or combat gun and you intend to use it with full power loads, wasn't it sort of a pointless purchase, when there are many other alternatives?
Reduced loads in a ten are entirely sensible when you own one, because no matter what you shoot, you should become familiar with it and continue to keep using it. Target loads aren't the only thing that someone should shoot with it, it's important to practice with full power loads as well.
It's kind of a different question when discussing the .44 magnum or other magnums. You can't get a .44 special that has the features of a .44 magnum, and same goes for the .357. You can't buy a .38 that is built like some of the .357 magnums. buying the magnum revolvers is actually a smart choice. Buying a 10 mm handgun if one doesn't want the baggage of shooting only high power loads, well, a .40 can substitute for it. It just depends on whether you want to use full power sometimes and sub low power or reload the rest of the time.
But it doesn't matter what we think, anyway, the buyer is responsible for his own happiness and if it makes him happy to have a ten and shoot nothing but bunny fart loads in it, it's perfectly fine.