> This means that at best, they use reversible encryption, and at worst, it's just stored in cleartext somewhere (this being Microsoft, my guess would be in the registry).
The status quo is that your password is already stored on their computer with nothing better than reversible encryption.
The status quo is that random business acquaintances and whoever gets automatically added to contact lists via some vulnerability (just wait, it'll happen) do not have my wifi password. Not on their machine, not to share, not access at all. I like it that way. We have something-guest as a SSID for a reason, after all.
The status quo is that your password is already stored on their computer with nothing better than reversible encryption.