Regarding patch 11.1.2.1100.
Since the patch consisted of 3 main categories (titles nerf, AC nerf & buff duration nerf) I'd like to adress them seperately.
1. ATF-titles nerf
First off, titles nerf. I get where you come from and personally I don't care too much. Nerfs always feel kinda bad, but this one will not be that noticeable, at least for me.
However, if the main goal is to equalize opportunity for new and veteran players, you have to realize that the major inequality stems from Orkham's corruption system. While this (to my knowledge) doesn't concern mdps, most pdps classes need more than one weapon, sometimes several of the same type, to maximize damage. The difference in damage is not a small one either.
For example, let's look at Warrior/Scout. When played with a Katana, the class does mediocre AoE dps and has strong singletarget damage. When played with a Spear, singletarget suffers and W/S is suddenly able to dish out a lot of AoE. However, if you switch Katana and Spear according to the situation, your overall damage in Orkham increases by roughly 30-40% compared to only playing with Katana and aprox. 15-20% when compared to Spear only.
In other words, you can't compete with someone playing the same class that is weapon swapping. This does not only apply to weapon types, but also to weapon mods. I chose W/S as an example, because I can estimate numbers. Classes like W/Ch for example need 3x the same hammer with different corruption mods. Atkspeed, damage & patk for the dot. All this additional investment and micromanagement is much more daunting than any title to a new player, that is just getting into instances. To be honest, I'm a bit scared what is going to happen to weapon swapping - since some classes depend on it to stay competitive, but I had to put it out there nonetheless.
2. AC nerf
You said this change was for more variety in endcontent. However, I don't think any of the older instances like Inferno will get more attention. I'm pretty sure nothing below rofl will be run by the majority of the players still, hence the change is just a big nerf to AC. Doesn't bother me too much, since you still get enough AC in my opinion, but Orkham pulls might be a problem in the future, given it's 30k/pull.
3. Buff duration nerf
Now this is the part of the patch I personally take issue with. Bosses that could be bursted in 30 sec will still get bursted in 15 sec, so that won't change anything for raids with good damage. For raids with less damage however (new players!) it's a considerable nerf. I see what you are trying to do, but I'm pretty sure it doesn't work the way you want it too.
Moreover, classes that have a lot of buildup to do, like Bards stacking their runes, Ch/Wl stacking their Forge, Rogues with their bleeds, classes with gcd skills that have buffs tied to them, etc. are at an disadvantage now, which is a balancing issue. Overall just a feels bad change that doesn't change.
On a positive note though, thank you for only buffing player damage in Grafu etc. and thus nerfing pets indirectly. Much needed and much appreciated, we'll see if it's enough!
TLDR:
1. Titles nerf: doesn't matter much, weapon swaps/having to build several weapons for one class is way worse for new players
2. AC nerf: feels bad but isn't that drastical, Orkham pulls could be a problem in the future though
3. Buff duration nerf: hurts new players way more than veterans, just feels bad
4. Death to all pet classes!