thos are literaly numbers of KSM from Legion , BfA 8.1 and 8.2 and SL .
only tier when more people completed KSM was 8.3 when people did m+ with crazy corruptions.
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i dont find it surprising. from my experience most of 215 pugs usually barely time +10 or go over time.
its like 50:50 - either you ahve people with whom you time it with 10 mintues to spare or you have people who cannot time it even with that gear.
and all of them have the same r.io .
thats the reality of wow pugs.
how do i know it ? i do +10 on 3 chars each week for few weeks not - why +10 ? it took me nearly 1 hour to get my 218 DH into 1x +12 this week .
maybe you have multiple hours to waste each week to spend browsing lfg. i dont.