I'm very dubious about this.
If they are necessary, won't steam redownload them every time if performs a game update?
If they are not necessary and not used, then they cannot affect how long it takes to load a steam game or make the steam client more responsive.
"remove these annoying launch hoops that you have to jump through everytime you play the games, but it'll save gigabytes of space on your PC." - what hoops are those?
Usually the main thing you need to speed up a game loading is remove the startup videos, and those aren't in the folders listed above but in different folders for each game.
Note: the folders mentioned on my PC amount to 25GB, which seems like a lot till you realise my common folder is 1.04 TB, so it's a lot of effort for around 2% saving.
It seems like this 'fix' is either useless or asking for trouble, if those files are actually used.
The man speaks a wealth of information. Yes it would be nice not to have the game launch the incredibly annoying startup process, but at the same time, on a 1Tb or 2Tb drive, only saving 1% or 2% hardly seems worth it, when in honesty, I could probably free more hard-drive space by deleting games I don't play any more.
Not to mention, next new game, the redist/dx etc will only get downloaded again, and then you have to go back and delete it each time. I would personally rather have those programs up to date, even if that means a long load time every so often
