Half Life 2 still holds up really well, honestly better than a ton of modern first person shooters. The only places it’s lacking from a non-technical aspect is enemy variety. If valve did a remake just updating the graphics and gun play that would be my only knock on it and that says a lot for a 20 year old game.
I wonder how recent semaglutide (ozempic, wegovy, etc) will affect this. It’s just come into mainstream recently and it seems like it actually does have positive outcomes for weight loss and addiction. When availability increases and eventual price comes down with patent expiration in the next decade we might see a huge change in this data.