Half-Life 2: 20th Anniversary Update

It's extremely rare to revisit a game like this for fear of new regressions. I'm sure every game goes out the door with 10-20 bad bugs that would be easy to fix, but it's just too late to touch.

It also sounds like the fixed a lot of art/ambience regressions introduced by newer source engines over the years.

Anyway, it's exciting to see an update like this, and a testament to their prior engineering that they can turn up all these dials without weird repercussions.

They already upgraded the game a couple of times since release. A big one was the Linux port which also saw many changes to the Windows version.

Regressions do happen which is why they opened a (public) bug tracker at the time, which is still in use: https://github.com/ValveSoftware/Source-1-Games/issues

If you have any HL2 issues, now is probably a good time to get them fixed before the developers responsible for the update get bored and move to another project.