Re: sacrificial parts, I recently had to rebuild a two-car wood (read: heavy) torsion spring garage door system.

The cleverest part was the plastic coupler [0] between the door-connected shaft and motor.

When the system originally locked up, the coupler broke. Consequently after restoring the system, I needed a $9 piece of plastic, rather than a $xxx new motor.

Made me sad that more modern things aren't designed with such value-protective degradation modes.

[0] https://www.amazon.com/LiftMaster-Coupler-Chamberlain-Crafts...