[startupsfail]

The default could be that a background upgrade should not be a foreground stress test.

Imagine you are driving a car and from time ro time, without any warning, it suddenly starts accelerating and decelerating aggressively. Your powertrain, engine, breaks are getting tear and wear, oh and at random that car also spins out and rolls, killing everyone inside (data loss).

This is roughly how current unattended upgrades work.