> what games published after 2020 can you play on LAN with one player creating a server and another connecting via IP?
There are tons, it really just depends on what you want to play. Looking at my steam library (installed only, so I can verify there's a LAN option) gives me:
Misery, Necesse, Voyagers of Nera, Infinite Rails, Windward Horizon, 7 Days to Die, HumanitZ, Barotrauma, Avorion
Keep in mind that those are just from the MP games I have currently installed, that are from 2020 onwards. I have 131 mp games from that release period, and only 33 of those are installed, and I only checked games that I figured would be likely candidates (i.e. I excluded Sniper Elite 5, Remnant 2, MechWarrior 5, etc).
So yeah, LAN/ direct IP connect options are still really common, it's just something to check beforehand. Also, the genre really changes the likelihood of having it.