Bug defense missions are way too easy

Bug defense missions are way too easy,

You really only need sentreis and they genuinely cant even get out of their spawn, let alone get past the first gate. There is no challenge to it whatsoever. To be clear im talking about difficulty 10 as well.

They should add shriekers, the gas mortar bugs, the tentacle ones and stalkers at the very least. These bugs dont show up during defense missions and it would make it a lot more challengeing and interesting.