They tried out making the mats required to craft the current gear difficult to acquire back in Heavensward. It literally killed off the entire crafting population and took years and a total backpedaling by SE of the requirements to recover. In some ways it's never recovered, like the total mess that is still the specialist system.

And if you locked crafters' ingredients behind savage, most crafters would riot at that as well. Crafters don't want to hardcore raid in order to craft, nor do hardcore raiders want to spend huge amounts of time and effort crafting in order to raid. Two different crowds that only allow for a very small, mostly superfluous overlap before people start getting very angry.

And if this stuff was sellable on the mb, the prices would be off the charts, like seriously 100million or more per piece. The heavensward pieces that were atrocious to make sold (or tried to sell) for 10-20mil and didn't even need savage mats.