I'm assuming this has existed since 1.9 since that is when the combat update was created and added the expansion to the end, can't add 1.9 so 1.20.1 it is. However the issue I think there is with end gateways is how buggy they are. You can place end stone blocks by the actual gateway inside the bedrock structure and it will teleport you out of it, either dying to fall damage or dying in the void and losing all your stuff which I think is super unfair. Its happened to me two times in my survival world and I can't believe something as messed up as this has been in the game so long. I've seen clips of people also dying to something like this online, but overall I think the system for spawning you out of the gateways should be reworked in a way that doesn't make you clip out of the bedrock and fall, if you put blocks inside the actual gateway part.

From testing that I've done, the way it could be more fair is if there is if the block of end stone is too close then don't spawn on that one and find the nearest one, like one that is on a island or etc.