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Older games still will use their own repositories
If the developer knows they need, for example, the VC 2015 Redist, they just have to tick a box in the settings for their game in the Steam backend, and Steam would sort it out automatically.
What this used to mean was that the VC 2015 Redist content depot was mapped into the app, and so the app got their own copy of it. It looks like back in October last year, Valve implemented and set a new option: requiredefaultinstallfolder: 1[steamdb.info] which it seems, forces the redist depo to be installed in the default dir, "Steamworks Shared" rather than into the game's directory.
I guess any new installs of games which use one of these common redists (which is a lot of games, the feature has been around a while) won't install their own copy any more and will just use the shared one. Neat.
Hmm. Or there might be other things involved. I'm guessing a bit.
Although there are worse offenders regarding waste of space. The Witcher 3 used the DLC system for free DLCs, but did not use that for their huge bonus content, which one always needs to store for the case of a file integrity check.
Some devs dumped the redists manually into their depots so you can't really change that unless you go back and update the depot itself, add the new depot, etc. For older games most devs arent going to risk doing that breaking their games.