I don't think it's a flex of epeen to clear a +9 buddy.
The highest ilvl in my group was 378 lol.
All of the mechanics are telegraphed or common sense. The only issue we ran into was tank not pulling pat's first in NO. +9 literally only drops 389. Do you suppose the instances are balanced around the ilvl they drop rather than at least 10 points below the dropped item?
The fact you can't just blindly clear +14/+15 is the struggle at this point of an xpac. That's why I suggested you aren't familiar with the difficulty bell-curve at the start of an expansion. It is not the same as ZM which was the end of an xpac and when stats are inflated and the entire player base has had two years to familiarize with affixes/routes/mechanics.
But it does suggest you're causing your own problems. If it is easy to get carried and that is the default, how are you even struggling? How did the people who are carrying you get gear?
This is some weird circular logic:
The instances are too hard
Only way to get gear is to get carried by people with crazy gear
Seems every person who makes their own group gets people with crazy gear
Can only get crazy gear by completing the content
So.. Nobody can complete the content to get gear but also its super easy and normal to get carried by people who completed the content and got the gear but also are still willing to farm low level keys out of goodness of their little pug hearts.
Truly, well done.