They update a certain amount of tanks at a time because it makes it easier to troubleshoot errors that PBR much cause with skins and such.
Imagine that WG did update all vehicles to PBR at the same time. Now imagine that many of these tanks have issues with their legendary Camos, or other skins, not showing up correctly, crashing the game, etc. It’s easier to do things one at a time because then WG can find and fix issues more easily.
Besides, they’re also working on many other things. New maps, Camos, tanks, events, attachments, etc.
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for obj 777 and 907 if you are 60wr+
epicdoge2137#0 has been warned.