its not weird idea at all, its for security purpose, most wordpress websites hacks are due to plugins or themes security issues.
Paranoia more like it, lol. Whoever suggested that to you is pretty naive. Wordfence + renaming the Admin folder via Wordfence is more than enough. Renaming the plugin folder will just cause problems. Like the one you already have.I could sort of understand if it was the Admin folder.
PM me if you wish to defend the "unusual" decision further. It's not really that important. Let's get back to the bundle addon.Nevermind. We better not clog up the thread with explanations