Allgemeines zu Alexz » All enchants scale, yet shoulder/leg enchants don't?

Pretty much what the title says. Enchanting scrolls lose their level requirement and with that don't cause BoA gear to become soulbound. I've read that this should apply to ALL enchants.
In that case, why can't we have the same for shoulder/leg enchants then? =/ Makes no sense having requirements on those yet allow other enchants.
I suspect it's gotta be something different between attaching a piece of armor (which reads as an enchant to you but might be something else in data) and applying a scroll.

I didn't find the right solution from the Internet.

References:
http://www.mmo-champion.com/threads/1343...-enchants-don-t

Cooling Solution Video Example