For WAR I would honestly revert most of the changes EW made, obviously together with a shift away from the awful 2-minute burst meta.
-Inner Release is now 90 seconds again, lasts for 15 seconds and grants 5 stacks of Inner Release, makes all attacks Critical Direct hits for the duration or until all 5 stacks of Inner Release are used up (a mix of both new and old so even with 2.5 GCD and bad ping you should be able to easily get the 5 Fell Cleaves out). No, we will not keep the ability to use Inner Chaos during IR, we go back to actually having to think about when to use Infuriate to not waste cooldown reduction from Enhanced Infuriate.
Ideally I would want to replace the guaranteed Direct Crits with an Attack Power buff but then we might run into crit variance issues and it now at least interacts with your oGCDs and Vengeance again.
-Upheaval and Onslaught cost gauge again, Onslaught's cooldown is down to 10 seconds. Bringing back a tiny amount of gauge management and the ability to manipulate it easily with Onslaught, increase potency if necessary.
-Since IR now has a 90 seconds cooldown again I'd probably decouple Primal Rend from it and instead grant a stack of Primal Rend Ready for X amount of Beast Gauge spent.
-Both Bloodwhetting and Nascent Flash heal for 50% of the damage dealt during those 8 seconds (back to the ShB design) but Nascent Flash only heals the target you've used it on, not yourself.
-Remove both the flat healing and healing over time from Shake It Off and instead grant everyone affected by the ability X% life leech for 15 seconds (how much % really depends on the DPS output we have in Dawntrail and should probably also vary depending on role. The main point is that the healing is no longer completely free and instead depends on how much damage you can pump out during it's duration, this also makes you think a bit more about when to use SiO)
-Lastly just combine Upheaval and Orogeny, we do not need separate abilities for ST and AoE and it create space for a new oGCD.
That's just the changes I would make to existing abilities.