Why do Buzzers even garrison?

[Plok 327]

I've seen the AI garrison structures with Buzzers all the time, yet I'm yet to find out what's the point of placing a bunch of mutated flies in a building if they can't attack from there?

[Madin 11]

I've seen the AI garrison structures with Buzzers all the time, yet I'm yet to find out what's the point of placing a bunch of mutated flies in a building if they can't attack from there?

They do attack, it is just a very weak attack that does 'SNIPER' damage (which means it is only useful VS infantry, and even then it is still very weak).

 

The hit FX and "unit under attack" EVA that you get when your units pass by garrisoned Buzzers is because of their weak attack.

[PurpleGaga27 40]

Other than the Buzzers, Assimilators and the Mastermind/Prodigy, no other Scrin infantry unit can garrison a structure.