The arguments seem to be based on a view against a consensus we seem to have here, in which a standard search path is not a place for externals, and that it'd be the same as a "user added path". You can check the github discussion and see what you make of it.

Anyway, I tried pointing it out in my first response to this thread, when I said: "you mention issues related to Pd's current "Standard Paths", given that it is clear to you that this is the best practice for externals. Surprisingly, that is not a consensus between developers. (...) "User added search paths" are not the same as a "standard path", I agree (...) That's also something I suspect is causing many confusion, which would be a notion that a "user added search path" would be exactly the same as a "standard path", but it isn't.