For easier debugging. For example the user tuanden0, with his R45/R46 plugin loading problem, could quickly check which folder is used. I also had 1-2 cases where I just didn't know which of my vapoursynth versions (or which plugin folder, portable+installed) are currently "active".
EDIT:
Quote:
Basically you should only ever use the user autoload dir unless you have some environment set up in advance for lots of people.
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user autoload dir = the folder in appdata?
I for example use the plugins64 folder (and custom VS installation). It is a bit annoying to always open the appdata folder. And for newbies even more since appdata is hidden by default.
vsrepo "fixes" it for us, but not for all plugins.