Tyranids is the one mainline faction that can be retconned out of the setting and it would be an improvement. It's just pointless faction lore wise that just makes the setting more ridiculously hopeless and keeps hinting at a vague threat. Doesn't help that player wise they are Tiefling equivalent.
Also didn't StarCraft 2 already do the alien queen shit and it was terrible?
Definitely showing my age here but I recall the Tyranids being introduced in “Advanced Space Crusade”.
It was a board game obviously designed by GW, as a stepping stone from the kid marketed space crusade, to more adult and complex games.
It was similar to space hulk, but rather than terminator marines v genestealers, it was marine scouts v tyranids.
Marine Scouts in this iteration wore lighter armor, no helmets and carried bolt pistols and knives.
The tyranids grew weapons, usually swords and some kind of spur launcher out of bone.
Initially the tyranids and the genestealers appeared to be separate armies/races.
This was also when there were ork genestealer hybrid models and a wider range of genestealer creatures.
Advanced space crusade wasn’t popular, it lacked a lot of the pure fun of the vanilla space crusade and was insanely complicated in its rules.
Experienced rpg and tactical game players were said to find it confusing.
Two of my friends had it and they never properly cracked it.
They grudgingly admitted that advanced hero quest was easier and made more sense to play.
Advanced hero quest was more like other dungeon crawler RPGs with a dedicated model and pieces base.
It played like dnd in Warhammer fantasy world.
I can only assume they did away with it because it was just basically warhammer fantasy role play.
Then a few years later I happened to notice that genestealers and tyranids were the same army and ork/eldar/other than human hybrids seemed to be absent.
Genestealers appeared to me to be a games workshop take on Xenomorphs, the Aliens from the Ridley Scott film series.
Back in the 80s, there was a fair bit more of taking stuff from popular sci-fi and making it copyright friendly.
My guess is that in addition to obviously being inspired by popular media, they were also trying to win new clients by imitating what was popular.