system
Given the following post, respond as if you're commenting on Reddit:
human
[Xcom]What is the point of biologic units like sectoids or mutons

Biologic units seem to have a lot of disadvantages over robots. They are squishier, need training, can panic, cant be turned off, etc. They do have some advantages over robots in that they are smarter, cant be hacked and the raw materials are cheaper. But no one is going to hack all robots at once, and the codex also cant be hacked. And if you need the smarts there is no reason against using andromedons and archons. 

The ADVENT troopers and faceless do play important roles but i see no reason to use the others. Especially when you can spam chryssalids instead. The chryssalid is a beast so no training is required and it does the replicating all by itself so no assembly required.

So why would the elders bother with those instead of robots/cyborgs with the occasional chryssalid swarm?
gpt
I don't know what to say dude if you didn't figure out their roles very, very quickly. Sectoids are psychically enhanced units that can throw entire teams into disarray if used right. Mutons in most cases are insanely tough and can cause massive damage during berserker raids.

You won't find robots that can do their very specific roles and are not nearly as common. Chrysalids are also not very bright and have little tactical ability.