What makes a good Hair Rig good?

I’ve been rigging for a while now and I’ve been curious what is by standard a good hair rig. I use Rigify for most of character rigging but I’m not familiar with the standards of a hair rig. Mostly I use limbs.simple.tentacle for hair which gives a pretty decent amount of control and I also used experimental.super.chain once but it had some kind of problem when things scale in the armature.

Any ideas?