Why does "New" never get removed from certain skins/avatars/etc.?

I know it isn't all that important but it might trick new players into thinking they can still get things when it's not possible anymore. It also brings out some OCD.

Some examples:

Skins: Valkalli Kali (limited skin as well), Plague Bearer Izanami, Baron Frostchild Ymir.

Avatars: Cutesy Chef's special avatar, Cutesy Merdusa avatar,

Event stuff:Odyssey 2017 pedestal (not that old but "new" has been taken off the celtic one). Everything that you got with T5 Anubis (except ward skins).

Normally I wouldn't even bother to post this but what really made me aware was a few things. Standard Erlang Shen, like, his default skin says new. It's only suppose to say new when the god just comes out on their reskin, not the standard one. Kali and Chaac viking skins, all 4 being limited and not new at all, but Valkalli is labeled new. Skadi Such Cold and Woodland Rogue Morrigan isn't labeled new, while Fafnir Griffindwarf is.

TL;DR Take "new" label off stuff the following patch update or once unavailable, please? And no, I'm not sure why I took the time to go this much in detail instead of just stating the question.