The mechanical failure category of crashes happen when the flying parts of a plane become less good at flying than they used to be.
Things like rudder hardovers, hydraulic failure, uncontrolled engine fire, engine detachment and similar are all things which can make the plane unflyable, and if flying isn’t possible anymore then all the previously useful fly-parts become huge and unpredictable liabilities that get in the way and make your problem worse - the forces that once kept you in the air now spiralling your plane out of control.
I’m not saying this crazy idea is a good one, but the theory is that you can just throw away all the problem parts and become a dumb capsule, which in that scenario would be desirable because it returns things to a predictable state.
I love the passive-aggressive move of Ēostre intentionally getting Becky’s name wrong in return