You can practically run everything that was launched before 2012~.

guild wars 2, war thunder, world of tanks, team fortress 2, CSGO, random free MMORPGs (you can filter them on steam).

Sometimes I will just go through the Steam Discovery Queue for like half an hour, it does a pretty good job if you properly give steam your opinion on the games.

Easier level design. I wouldn’t be surprised if 99% of open world games just had their landscape generated and then slightly tweaked afterwards.

Daggerfall?