Yes, for real. I am not targeting bedroom developers like jakibaki but, for example, large, multi-milion-dollar companies like Canonical who assume everybody has huge screens and state-of-the-art CPUs that came out last week. And thus three quarters of dialog boxes do not fit on my screen and my PC does not boot after a kernel update because they turn some super-duper feature on by default.

If anyone is at least half serious about developing software, they really should be testing on more than one device. "It works for me" is just Not Good Enough™.

"More than one" = "at least two". More is better but if you have only two, then it makes perfect sense to make the second one the lowest spec you can find. Or include a disclaimer, "only works on 6GB deca-core or above, because I have not tested on anything smaller".

Yes, for real.