not all Pokemon needs to be completely useable in the metagame. We do see a lot of crappy water types too like Luvdisc, and normal types like Dunsparce... Grass types got Tangela, Sunflora and etc... Bug types also got its fair share for non-usable Pokemon, like Butterfree.
a Pokemon with high attack, high defense and high speed plus speed boost is not a POkemon. it's a monster then... Bug got its 10 PP physical move already, which is megahorn (deadly attack power too.) Hidden Power Bug is also very powerful, with good PP and 70 attack power (that's only 5 attack power off the almighty grass attack Leaf Blade.) If they throw in a bug attack that's similar to Aerial Ace where everyone can learn it, you'll see it everywhere very soon if such a tm exist...
bug attacks are strong against so many elements its' not even funny. But good thing is that the amount of bug attacks are limited so it is under control.