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Valve didn't do shit, they just updated hud.txt (file for how hud sprites are defined for different resolutions) to have more entries for higher resolutions and it fucks up everything for mods. For some mods, the way they implemented the resolution thing for the 25th anniversary update sometimes conflicts with outdated hud.txt file and it just does this (experienced it firsthand while trying to get people to play my mod)
I believe this issue is caused by the custom client.dll used by other mods, which may not include the HUD scaling functionality, as it's also an issue with They Hunger.
Example:
At 1600x900, Counter-Strike's HUD is easy to see, but at higher resolutions (mine is 2560x1080) it's tough to see. Valve solved this problem with Half-Life by making scaled versions of the HUD elements, but as far as I know, they haven't done this for any of their other games that use the GoldSrc engine.