My guess is that the game gets really repative because that is kinda the Tyranid style. Waves and waves of teeth and claws. Maybe some variations, but how long can you send swarms of the same guy before its boring.
I guess Vermintide and 40k version (can’t remember name) make it work but they are very different games.
The Left isn’t going to any extremes. They do almost nothing and it is what is allowing the right to swing to their extremes. This “both sides” take is disingenuous at best. A better analogy is the american people are strapped to a guillotine, the right is ready to release the blade and the left is still trying to debate and dicuss the merits of not dropping it.