How come Blacksmiths/Leatherworkers/Tailorers can't disassemble gear like how Enchanters can disenchant?

Gameplay Professions
1

I feel like I should be able to just throw a chestpiece into the big furnace in Dorn and get a few pieces of (insert ore) out of it… leatherworkers and tailorers just need a pair of scissors…

2

because then you make Enchanting pointless

you can recraft gear though , thats good right?

3

How would it be pointless? disenchanting gives mats for enchanting.

Dismantling would give mats for further Blacksmithing.