Zulrah was the ultimate money maker. It was inefficient to do anything but Zulrah since overtime it became easier to kill, so there was no reason not to learn it. Now, other money makers might come back into the spotlight instead of "just do Zulrah".
The 80s-90s combat bracket was cancer for BH. Voiders were horrible to go up against as a zerker, and especially as a 1 defense pure. You're almost always guaranteed high hit combos if you're a voider, it was simply just too easy to dominate BH. One thing I wouldn't mind is if elite void had pre-nerf damage, since the 100+ bracket tend to not use void ranged as much in pvp.
Yea, Jagex might have gone too far with the nerfs to the serp helm. No more venom, same str bonus as nezzy helm, no prayer bonus. Since prayer bonus seems to be favored over defensive stats in most situations, I don't see a use for serp helm anymore unless you wanna pay for poison protection.