I hadn't seen this post before:
What would be the point of capturing and researching them if everything was given on a silver plate? Two words: NO TUTORIAL. I hate tutorials. After finishing the tutorial, there is often little left to actually play.
Well, although that's true, there is a huge difference in replay value for Piratez. Playing through the first time is like a really long tutorial where you learn the factions, ships and tech, and the second playthrough is very different. The first playthrough actually feels a lot like a tutorial..
Quite pointless to give them psi items because they can have build-in psi capability, leaving both of their hands free to do conventional harm
I mean you can set which "alien psi-weapon" they will use. Although the ability is built in, it still calls on a certain item (which you can see modified in the psi-LOS mod).
Removing that item makes the game crash as soon as an alien tries to use it (since it is calling on an item that doesn't exist). To get no psi, you set the TU cost to 999. OXC only uses one psi-weapon, which means any tweak you do will affect all psi-aliens. But OXCE allows you to set which item is referenced by which alien in the armor section so you can actually change which they use.
That would allow a tweaking of psi-capabilities for different aliens, changing the TU cost (and thus ability to use certain powers) of different enemies. You could have certain "intimidating" enemies be able to use panic only, and only in LoS (and maybe with a big range malus, so they are really scary up close but not so much from afar). Weaker psi-enemies who can only affect you in LoS while stronger ones don't need LoS, etc. The only thing I'm not sure is if the AI can use the "special attack" of psi-items to actually deal damage like the player can.