It would be nice if it was again possible to run it in current Mac OS. The original Half life still lists Mac OS but with incompatible information (newer versions of Steam require recent versions, but HL only runs on old 32 bit OSX)
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(disclaimer: I work for CodeWeavers, we sell CrossOver which should be a great and easy way to play)
edit: tested out the 20th anniversary update on M2 Pro, it works great!
Better translation layers are what made the Steam Deck possible.
If Apple doesn't care about backwards compatibility on their platform, why should Valve or other developers be burdened with the added cost, especially on a platform with small market share that won't drive many sales?