Bugs in a front end are easily fixed on demand as you say. The situation is a lot different when dealing with a (supposed to be) immutable database. If there are bugs that corrupt the state, recovering from that can be very painful, or in extreme cases not even possible.

I agree that the development process is a bit light on testing. Ideally every operation would have a comprehensive set of unit tests across the full range of allowable inputs and states, as well as random (fuzz) tests, but this is actually very difficult to achieve in practice. Hopefully the developers will make steps in that direction though.