The people who do that get to experience all the following raid content, its not like they are stuck with only one raid tier forever. Usually if a new player joins our guild he will want to find pugs to try out some of the previous tiers if he feels like it.
---->>>"""If he feels like it"""<<<---
This is the way it should be.
Working as intended.
(i do liek the idea of completely outdated raid content giving out other rewards then gear when it becomes obsolete tho(still gear, for transmog, but then also something more on the side)).