So, AI Eyes aren't actually that plentiful. There are only 11 or so in my galaxy right now. I just notice them more when they do show up. I think i've got a bias, and a worst-of dual-ai pairing deals in the past.
I am wondering if you can prevent Dire Guardian lairs from spawning within two hops of a homeworld on difficulties below eight. Having them shape your initial expansion seems like an interesting challenge, but I kind of feel like colonizing homeworld adjacent systems is a core '7' principal of play, albeit from old wiki advice. Might make cluster maps a bit boring though.
I have noticed some out of depth starships in homeworld adjacent systems (mk2 zenith and mk4 flagship hurt) that can't get guardians, but it might be something I've mistakenly set up, so I'm starting a game or two with full visibility, logging, and five-minute auto-saves.
I should be able to track whether it's something i've been doing, accidentally agroing, or some rare quirk of circumstances since I would spot it in 20-40 minutes of game start, but not in the first ten or so.