There are two cases where modifying health is ok
1) Is when simple statistic alteration does actually affect the gameplay in a very noticeable way, where playing "better" isn't the solution.
-Most games when they make enemies 2x harder typically you are playing the game exactly the same except maybe more cautious.
2) When it is coupled with some alterations either to enemies, new enemies, layouts, and what have you.
Anyhow I am passionate about this... But I don't think I really want to debate this, I just want to put my two cents in that I'd personally would be ticked.
I really think people should move on. Not because I am backing out, but because I think people need to put their opinions in and not get bogged down by one naysayer.
So your ideological argument only applies as the game gets harder and not easier? That makes no sense.
It has more to do with how the easy mode it set up in this case. Which is that it is meant to be a mode your supposed to coast through.
I'd prefer it is Explorer mode actually changed things up too, but how to do that without removing content is beyond me (well maybe changing boss' signature moves)