the horror is ripping the wire out of the crimped connector when you are miles from anywhere. I might be able to Mcgyver a fix after I fix my flat, but it's just as likely that would be highly unreliable. I friend of mine has problems with his, I haven't ever asked him why. Last time I saw his bike, he had the wrong size connectors on it, I assume that was due to a wheel changing mistake. He really needs to upgrade to the connectorless system.

The connector is not a common size. You have to go to a specialty store to buy it. No automobile manufacturer uses this style of connector, and haven't for the last many decades.

You could 3d print a connector like the Shimano that would work the same, probably a good idea