ChrisI guess I'll weigh in. As an automotive shop owner, I still see ignition failures of coils, plugs and connections. I still see vvt cam phaser failures, I see direct and port injector failures. None are immune. Some better than others. This is why I am adding redundant spark, all sensors, and also ECU's to my conversion. I am also ridding my engine of VVT as its not even close to necessary with the loads a propeller puts on the engine. If you can make something less likely to fall from the sky without reinventing the wheel I say go for it.
What longblock are you converting? Our very own Ross flies with a single FI and EI. Very fastidious about wiring integrity and clearly believes in his own system. That said he makes dual options avaible in a very clever ways to those who are not there yet. This short video was posted about 2 weeks ago.