People have always been doing the ilvl thing to get LoTA and ST so why does it matter now?

Well because there is a new expansion with new players that have only a few alliance raid unlock

So someone messing with his ilvl will be thrown to those players

And therefor will take a spot on LoTA/ST and possibly allow you not to have LoTA/ST

So basically you have

player A1 (only have lota/st unlock) queueing for alliance roulette
player A2-A3 (queueing for lota or st)

Player B (messing with ilvl to get lota or ST)

Player C (the complain... I mean the filler)

So any players thrown to any player A(1-3) will get one of the two ST raid regardless of player B