The use of more than one screen reader is already "generally accepted practice" among a very large part of the screen-reader using population. Now with both NVDA and Narrator having two at your fingertips is far less of a challenge.
It is a simple fact that certain sites "play better" with certain screen readers at certain points in time. If one has the option to have a "backup screen reader" and to learn enough of the basic commands to fall back to it when one's favored screen reader is misbehaving with a given site, program, etc., that's simply the wise thing to do.
If you can't, you can't, but that's a separate issue. And it's completely separate from promoting what is, in fact, best practice for the real world. Whatever the area of pursuit there is a generally accepted "best practice," but not everyone can do it. That doesn't mean it shouldn't be encouraged for those who can.
Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134
The psychology of adultery has been falsified by conventional morals, which assume, in monogamous countries, that attraction to one person cannot co-exist with a serious affection for another. Everybody knows that this is untrue. . .
~ Bertrand Russell