Well correct me if im wrong but the current endgame is 4 bosses, which isn't a lot compared to all the dungeons and primals and all the other stuff we have in the game. So it's a small part of the entire game. So overall I think the game is too easy and like I said I can't say anything about coil, but I feel like 4 raids isn't enough hard content to say that the game is hard.
And yes I'd like to try coil but my work schedule stops me from planning ahead. And I'd rather do it with 7 ppl that I feel comfy playing with than 7 random people through party finder. I have had really bad experiences in party finder where I have had raging people in practice groups, so I try to avoid it.