Posting again after some time..

I really feel that FCob has hit some of these points really well. Specifically, it's less overall emphasis on one-shot/mechanics (though they are still present) and values more on players being able to perform their roles.

Perfect example is the DPS check of T10 and the enormous amount of damage that stresses the healers in T13, as well as the strict dps check and management of tank cooldown for akh morn.

These fights are undoubtedly made easier as you get a higher ilvl or if echo were introduced, compared to say T5, T9, or even the entirety of SCoB if they had not make any changes to the actual mechanics. This allows a fight to naturally get easier as time passes without the need to do make huge changes, and T13 is a perfect example of this imo.

Don't get me wrong, they're still difficult and nothing short of having a pre-formed static would be ideal, but having more hp to survive marked megaflare is definitely nice to have.