Again, healers "need" a redesign according to you. A lot of people don't feel that way. Why is your opinion on the matter the "correct" one?
There are countless reasons why healer queue times could have changed over time. I could come up with plenty of other possibilities, but our own pet theories can never be proven and are not evidence for anything.
People generally don't find someone ignoring the bulk of their DPS rotation to be acceptable play in any level of content- they would inevitably get called out for it in some roulette or another. Introducing a more complex DPS rotation inherently raises the skill floor, even if the old rotation were technically still possible, and that would lead to some number of players, however small, quitting the game and would narrow the potential playerbase. I've still yet to see a compelling argument as to why SE should do that besides "I personally liked the old way better."