Comment by momenti

Lilium's plane has 30 engines, multiple independent battery packs, and electric motors are way more reliable than jet engines (due to being so much simpler). A Lilium plane may have a 1000x higher chance of a crash in case of full engine failure, but perhaps that can be compensated for by 1000x times simpler/redundant propulsion technology. This seems to be very hard to assess in theory, so we probably just have to wait and see how it performs in practice.