So I had the privilege this past reset of co-tanking a H NH speedrun with a top 100 US guild and I took the opportunity to ask their MT (also drood) about his/her opinions on the 7.2.5 changes. Obviously nobody is stoked about it, who would be... but overall balance-wise their opinion was Barkskin needs to be on a shorter (30s) CD to compensate for the massive hit to our magic mitigation. This was according to their guild's experience on the PTR, obviously nothing being final, where there appears to be a pretty fair amount of magic dmg in ToS. So as of the changes we know of, it might be pretty rough (Mythic especially)
As far as "BiS" leggo setup, the Elize/Luffa meta may not hold. Their opinion was Mangle ring + relics overtaking Thrash relics + luffas, along with Boots becoming BiS. Obviously others have their situational uses and strengths but I see where this person was coming from. Mangle ring giving 25% damage + 7/7 Vicious Bites giving 49% damage = massive mangles and more frequent uses than thrash with gore procs, albeit for single target use instead of cleave (Incarn aside). However, with 3x Thrash relics dropping in ToS vs none for Mangle, these will be harder to come by
Boots are pretty self explanitory with FR becoming so important with T20 bonuses and the chunks we will be taking from unmitigated magic damage
Obviously player preference, raid comp, and encounter will affect this but I thought it would be interesting to discuss with 7.2.5 likely next week along with Tomb the following week.
Cheers