An attempt to better understand "Legacy League"

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Blunthex wrote:

Spoiler

So I'm going to reference an item from Diablo 2. Windforce.

So let's say Windforce, is an item thats able to be found in the game.

But GGG could decide, to not have it in the game for some reason? and move all these characters to legacy. Where they can no longer find this item, and players cannot find it in standard league anymore either?

Is this the correct way it works when dealing with items that the devs decide to not have in the game for some reason?

What if Diablo 2 had decided, "Oh we don't want Windforce in the game any more"

Pretty crappy way to do things eh?

Why would there ever be an item they would essentially delete from the game?

I'm a PoE n00b but have many many years of experience with other games. And I definitely don't want to grind some build just to find out, my 1 item I needed/wanted is no longer even part of the game?

Why is this even a thing?