These days, you can't shake a stick without bouncing brown beams around the room. Raytracing has been a hot high-end graphics trend for a few years, with new games boasting support for the complex lighting simulators and old games being retrofitted with shine. This year, a new Half-Life mod will add raytracing support to Valve's seminal shooter, and even as someone usually perfectly happy with old games looking old, I think it doesn't look half-bad. See for yourself in the new video, below.
Valve are working to upgrade a number of their more popular games for the Steam Deck, optimising controls and interfaces to play better on their upcoming portable powerhouse, the Steam Deck. The Half-Life series, Dota 2, and Counter Strike: Global Offensive, either already have or will receive upgrades designed to make them "better experiences".