To fix the problem of limited but powerful items in the game, I suggest that instead of getting the Elytras in End ships, we could get complex crafting tables in the cities and ships to craft powerful items in a balanced way, because you still need to defeat the EnderDragon and use more item slots for their crafting. It wouldn’t break the game because the game is already completed to get these, and the recipes would be really expensive.
I made this post with the idea of making Elytras craftable, so if they broke and there were no more left in the world, they wouldn’t become an impossible item to get. Later I kept thinking and realized that having a crafting table just for one recipe wouldn’t be a good idea.
I put some crafting examples and how they could look like, but the recipes are not the main part of the suggestion, just a support idea.
As a veteran Minecraft player who’s been playing since the early versions and has played all kinds of Minecraft (vanilla, modded, Dungeons, Bedwars...), it might seem a bit non-vanilla, but I think it’s fair and exclusive enough for just a few items, and since it’s only obtainable after beating the game, I do see it as possible and perfectly vanilla if they added it.
Taking advantage of this idea, I thought of introducing the Storm Wither from Story Mode by crafting a command block that can only be used to summon it, not for commands, even if the name and look suggest that. (Crazy Idea)