The latest version of godmode 9 has injection. You can inject a cia's APP file into H&S. Still while I agree is not to be a continuously used method, is there maybe for necessity reasons in case of future reasons, or historic reasons. While rosalina can load homebrew, not everyone may use it for whatever personal reason.
Not saying you was wrong in your statement, just each person has different reasons, I dunno what they maybe, could be that he switches sd cards a lot and just wanted a more permanent solution for fbi usage. A better idea could be to just install fbi to nand instead of injecting it. But I wouldn't know of any consequences to that so don't listen to me.