No, my friend, I'm not the expert. The guys who build the engines are. And regardless of why engine builder adopted EFI, it's been a good thing for engine reliabilty and performance.
EFI, combined with onboard computer control, gives you the ability to map precisely, which is why engines like the 1075 deliver power at the high end of operating range (like big-horsepower carb engines did) and still idle smoothly at the docks (like big-horsepower carb engines often did not). And that's just one benefit.
The early versions of 496 engines did have problems when builders like Mercury switched platforms. I'm sure some were related to EFI, and some were not. Kind of hard to lump them all into the EFI bag if you didn't follow up.
You "believe EFI systems will eventually become more reliable with time?" Sure, anything can and should be improved, but for the most part EFI is already there. Ask an engine builder.