An idea for End armor and tools

Supposing we get an end update and it has new ore I have an idea about the properties of the armor and tools you make with it. 
When it comes to what it does it should match something existing in the game, and in the end we have a unique bit of equipment, the elytra. The unique property of the elytra is that when it breaks it doesn't vanish. This new ore could do that, however there should be tradeoffs. First off, this stuff should be no better than diamond. Netherite will still keep it's spot as the best metal, and diamond is the cheap plentiful option, but this will be a permanent option. As far as speed of the tools going any slower than diamond will likely have no one want to use it, even if you don't have to worry about it breaking. When it comes to armor a point or two less armor is something many people will take if they don't have to worry about losing all their enchantments when they fail to notice their durability being low. People already sacrifice armor for Elytra, they'll give up some more for piece of mind. You can also knock it's durability down a bit as well, giving the player equipment safety in exchange for having to repair it more often. 
My personal preference would be for only the lower durability, otherwise make it equal to diamond, but having unbreakable tools and armor is a powerful option, so I see the merit in taking them down a peg or two.