Here is where this system falls apart completely. You have ZERO AND I MEAN ZERO incentive to help anyone boost a key now because if you do anything below a 10 you are penalized. So you do one 10 to get the weekly.
This is a brutally stupid system if you apply it to the real game. YOU ARE SCREWEDDDDDDDDDDDD if you need to boost a key because automatically it takes your 1st M+ and uses that to determine your first reward. Then you need to do 5 +10's to get the 2nd reward lol
Only way this system works if it does not take your M+ runs in any particular order and just look at the top ones and goes down from there. All of this absolute stupidity to avoid doing something simple like a gear vendor.
People that they are trying to lure back from other MMO's especially FF14 that I have seen are laughing at how silly this system is. I think the system is too complicated for people to grasp just how much it screws the playerbase until you try it out.
If you works via a ranking system where it takes the top runs and not an average then it is easily exploitable but if it takes an average then M+ boosting is basically dead because you are highly penalized.