Undyeable gear... what?

[Welsper59]

It's just the way they want it. There's no need to be so demanding of every little thing, just for the sake of wanting more. AF/endgame gear have specific lore or significance behind them, your generic crafted stuff do not. It makes sense. It doesn't have to make perfect sense, but why should it? Player customization is a luxury, not a necessity. You play the game that they want to create, by the vision that they have for it at the time, not something that you think is free-reign. Their vision is more lore centric than player freedom. They might change their mind about it in the future, but for the time being, not gonna happen.

If we're going to go with lore being the reason, then isn't that even more of a reason to allow us to dye our endgame gear? Our characters play the role of the main characters of FFXIV, so why can't we have our own look like previous FF main characters?

Lore is actually something that exists without a players existence, something that is established as a result of official writers with canon elements. Your personal existence in the game is not tied to any creation of lore, you only experience it.