in a glider, the electronics are not directly necessary for flight safety, however we are at the point now where we have almost an all "glass" cockpit. I do still have a couple of old "steam gage" instruments (altimeter and airspeed). The rest is LCD displays powered by the instrument battery. The annoying thing about intermittent power is that you may lose the GPS based flight log, which is what documents your flight in a racing event. No flight log = disqualified. I had intermittent connections in the spade connectors, and quite a lot of voltage drop in the system all of the time. Intermittent cheap fuse holders too. All replaced now by screwed down terminals on real aircraft circuit breakers tied together with tinned copper buss bars. The carbon fiber laminate work in the glider is a work of art, but the electrical installation is (was!) pretty agricultural.