[DenisM]

That argument applies to any effective antitheft device. Shall we take it you're against all effective antitheft devices in general?

[stbtrax]

If you lose your key to your U-Lock, you cut it off. If you lose the key to your frame... saw your bike in half?

[DenisM]

You plan ahead. I made duplicate keys to my condo and my car and gave them to a couple friends who can be relied on.

In a system with electronic lock you could have unique factory key stored at the manufacturer, and recovered for a $30 fee upon inspection of id/receipt/etc.