Recent similar thread about Noctigon/Emisar: How Durable are Hank Lights? Any hard-use photos?
I don’t think complexity necessarily contributes to increased failure (theoretically it can, sure). The aspects of engineering design and construction matter more. For components, even the cheaper chips and such are pretty reliable but again, engineering is a important aspect there and components used at their limits or in designs that may push them past their limits…may fail. Hank does good lights, uses good parts. Generally if the flashlight world discovers components that are shoddy or undependable, everyone stops using them (that has been seen before in certain types of 7135 chips).
Even a very complex light like those with lots of aux leds and the additional soldering and wires crammed in such tiny places can last forever and survive impacts if constructed well. Hank’s drivers seem to do pretty well but other than impact damage (which few lights are really designed to handle well, from most brands) driver failure is probably the most common irritation. Even those that are designed a bit better are often not designed as well as they could be, so it’s somewhat expected that they will go at some point. This is partly due to engineering talent, partly due to keeping costs low, and partly due to space constraints in most lights. It can be done better but will people want to pay the end cost?