While this is probably not relevant to this topic (due to speeds involved), the crashworthiness of a modern design is very different to that of a lot of stuff that is still flying.
While most planes, including I believe microlights, are supposed to withstand the same +3.8G (or whatever it is), it's obvious that there is a vast difference between the cockpit strength of say a Cirrus or a TB20 (fully or partly composite), and that of most other stuff.
Most GA planes (designed in the 1950s) have the cockpit rigidity of a cheap caravan.