The only way “LFR” is harmful to the game is if the argument is, “There’s too many Raid Difficulties.”
And yes, I agree on that. However, the solution isn’t to “delete” lfr.
It’s to delete “Normal difficulty”, rebrand LFR difficulty as normal. Delete Heroic difficulty, and rebrand Mythic as Heroic.
Now that I have said my piece, I am going to duck behind this desk to avoid all the repercussions of my unpopular opinion.