100+ is still crazy much.
I've done five, cause it was so awful.
Blizzard said once Mythic+ was an alternative to raiding but now it feels mandatory to raid.
My guild is soon 7/10 Mythic and every raider has, like yours, 4+ legendaries and 54 weapons. They all do crazy much Mythic+, basically all they do.
Me on the other hand did 5, level 3, 5, 7, 8 and then a 15 when i had better gear, got the achievement and I was done. I also did every dungeon at +2 for the achievement to do them all, but that doesn't count really as it was no progress just a quick clear.
Got 7/7 M, 3/3 HC and 10/10 HC and I farm only NH Norm/HC weekly with 900 ilvl equipped, I COULD be ready for Mythic NH BUT
I have my weapons at 43, 40 and 35.
I can't raid with my guild even if I wanted to due to low weapons, meaning, Mythic+ destroyed my chances of Mythic raiding this expansion.
You can't get your weapons high enough by only raiding, especially if you don't go back to old tiers
Back in the day, you could farm only current tier, Nighthold in this case, and disregard old tiers and dungeons, like it should be!