Neither of those games interests me.
Doom seems to run off a token system anyway where your basically fighting the game itself as a collective like the borg or something
https://www.gamedeveloper.com/design/cyber-demons-the-ai-of-doom-2016-
But you're saying they haven't progressed in 20 years. They have. They were so good in Doom Eternal on release they were nerfed several times by id because of the difficulty complaints. Not the game journalists.
With God of War on a first playthrough on the hardest difficulty, you can predict the AI patterns. Where on New Game Plus, the AI behaviour and patterns changes. Same patterns but different encounters of how they are delivered. Sometimes extensively and more aggressively.

)...relatively easy to make genuinely 'smart' and 'clever' AI. For a shooter you could use neural nets and let the AI run around in simulation and get extremely good at killing players and exploiting every single flaw in your engine....not much fun to play though, and there's little scope for tuning.