I know very little about AI and game mechanics, but knowing how early Fromsoft games were (e.g., Kingsfield), a basic AI in Elden Ring is very unsurprising. That's not necessarily a bad thing!
My vote for "high tech game AI" would probably be this old mod for Fallout 4:
>PANPC (Pack Attack NPC Edition) is a unique scripted AI management system for Fallout 4. Rather than treating each enemy as an individual proximity-based reaction agent (basically, a mine with a gun), this system generates social feedback between NPCs belonging to the same or allied factions.
>Enemies factor the overhaul health and success of their “team” into their tactical decisions, adjusting their strategies based on their social and threat awareness. As a result, they will switch between ranged, melee, defensive, and offensive tactics based on their perceptions of team advantage and individual risk.
https://fallout.wiki/wiki/Mod:PANPC_(Pack_Attack:_NPC_Editio...
F.E.A.R. 2 has the best AI that I can think of. Wonder if it counts as high tech or they just squeezed a lot of juice out of basic techniques
My favorite high tech AI was Crysis. Might have been an update after it was originally released. The enemies will aggressively attack but then get quiet after you've taken cover. Eventually you'll realize some of them are flanking you while others keep suppressing fire on you to stop you from moving. You can hear them yelling to one another. Very cool touches.
That reminds me of First Encounter Assault Recon, where the AI had fairly simple rules, which worked well with the level design to make the enemies seem intelligent, especially as Monolith added chatter to make them seem even smarter. And then one of the expansions had a bunch of open areas and the AI didn't handle those well so the trick didn't work.