The problem with people complaining that there's no content

[Absurdity]

Actually, the reason extremes are easier is so that they can be farmed. Savage can be a lot less forgiving and sometimes you are glad to be done with it for the week, whereas if Extreme gave you this feeling then you wouldn't feel like doing it 99 times.

Doesn't mean that people wouldn't do it, people run a savage fight 100 times for a fancy number on a site that isn't even officially acknowledged. Hell, people run PotD solo simply for a spot on the leaderboards and that is arguably more of a time investment and frustrating experience than any savage fight.

What? The only people that go apeshit when grind is mentioned are the ones new to MMORPG. Even WoW vanilla was grindy as hell, and it was basically a light version of Everquest. Grind has been a thing in RPGs since forever, and that includes MMORPGs.

Those grinds usually led to some tangible rewards beyond a rectangular piece of text that says "Yay, you did it, conglaturations!". Unless you're really big into achievement hunting a lot of these grinds are pointless busy work that reward nothing and that nobody cares about.