I dont at all think your graph is completely wrong. My main points were that power increase is going to be exponential almost no matter what, and that the big power boost at the end game is mostly from tomes, not items, and the big problem items are really the early sanctum/spires stuff, that then, everything higher (items and mob difficulty) was balanced around.
I guess I feel a dissonance with the fact that some item nerfs were to things that I didn't see causing balance issues in any way whatsoever (eg: BW Rez, Taesh ear nuke upgrade, and now making cella/crys just about never worth meeleing with)
How did a fast 50% rez mess up anything? If you dont want it fast, I can kind of see that, but at least keep it 50% in line with everything else.
How was a 1000 damage upgrade on the 4 hours reuse ear at all broken after 6? tiers of content? If anything was broken it was the first taesh ear, not the upgrade.
I think the power of Crys/Cella is being overestimated in general, but if healing procs are really a big worry, I think most priests would be fine with just getting some ancient hammer type upgrades over the tiers - high proc rate - lowish damage - no mana drain. Maybe let the SR staff be unique in having more damage/dps, but retaining a health/mana drain (and just remove the heal component) so it really lets healers be half-assed dps on content they are vastly overtiered for.
I dont think CSI9 on 43 robe would have been anything crazy either, but I've given up on that one. Starting to think the nerfed fae robe might be better than 4.3 ever was, regardless.
I don't know what the larger solution is here, but (over) nerfing some of these items that come from extremely difficult content that many people spent massive amount of time obtaining is not the answer. These nerfs have not impacted the overall power any guild's raid force, they just took away something we thought was cool and fun. I can still parse 1500. 10k mana clerics with 24FT and MC9 etc can still heal for a loooong time. I honestly thought the heal weapons were a detriment sometimes because all the priests would be trying to meele and not watching the tank as closely, and the tank would fall over.
I do very much appreciate you taking the time to read and respond to our complaints though. I know its not a fun job, but just knowing that you/devs have read and considered all this makes me more optimistic about it all.