In HW the standard BLM rotation was more 4 Fire IV than 6, due to Enochian being link with Blizzard IV, and because at this time, both Fire IV and Blizzard IV were 3s cast time (opposed to 2.8 and 2.5s now).

So SB change a lot of things for the BLM in use, as the standard rotation moved a lot.

I would say it's normal jobs got rework as the game go on as it gains in maturity. But i think the biggest changes is "Healers need to gcd to heal" to "Good healer make few uses of healing gcd", and i'm not sure people would love to go back as using gcd for it. Personnaly I would dislike to.