To me, it was a breath of fresh air when A Realm Reborn was released and the combat emphasized reactive gameplay over proactive gameplay (dodging, and keeping close eye on the enemy as opposed to spamming large rotations over and over again). Sure, there certainly still were rotations with A Realm Reborn, but they were nowhere near as cumbersome than what Heavensward brought to the table. You still need to dodge and closely watch the enemy in Heavensward, only rotations have a much greater emphasis and have gotten much more complex.
With so many good games being released; many want a game they put down and easily pick up later. I by no means feel that difficulty should be nerfed, but I don't think the investment time to get back into the game should be so high. Take a game such as Dark Souls. Difficult, (arguably) but the combat is simply light attack, heavy attack, roll, parry, etc. Highly addicting, fun and difficult gameplay that the player can simply pick up without having to research how to play again. With Heavensward, if I take a break, or if I want to switch jobs, I need to spend a good amount of time in front of a dummy just to memorize my rotation. To be honest, the thought of having to get familiar with the rotation again often prevents me from logging in. You can still have a difficult game without forcing the player to memorize attack patterns.
Those who have mastered the rotations and never take breaks from the game probably enjoy it. I'm sure many of you (likely most) will disagree with me. However, as someone who frequently likes to try out other great AAA titles; it can be frustrating to return and feel like I don't know how to play anymore. I don't think the amount of abilities should be reduced; however I feel like the game should be designed that you fire off an ability as a "reaction" as opposed to one huge "proactive" spam of abilities to buffer your attacks over and over again like a mindless drone. Memorization is not hard. It's a growing pain I feel many have to repeat over and over again. My two cents. I'll go hide now.