I love how EGS reason is biased in the sense that not everyone can order an English released manga from their country, as it takes even more time to get translated to most of other languages, if it even gets translated either the legal way or not. I guess that it's better to make a general rule for the whole world to delete their uploads then ... ?
Centralizing releases permits people to not have to go over every single TL/SC website, which is why such sites like old Batoto or Mangadex exists, it's that it enables easy navigation for the user.
One could argue that it lessens the impact that the group had, but after a few years most groups disband or have replaced almost every member so it's kinda futile to try and talk about involvement, when some drama doesn't occur inside the group, or when storage failure happen, which are also good reasons to centralize everything on a website immune to group problems.
But hey, what would an unknown scanner know ? ?