I think you really made a very good point. A carb will put up with a lot of stuff not working well and still run. You can have vacuum leaks and exhaust leaks and in my case massive blow by, a cam with a few round lobes, bad electrical grounds everywhere and a carb will still run. Often people put efi on to solve a carburetor problem only to learn that their issue is really a bunch of other things. Efi requires a system that doesn't have fundamental issues. It rewards you with greatly improved drivability and the ability to tun without getting your hands dirty.
I went from carb to fitech and 4 months later ended up rebuilding the engine. I had known for a while that the rebuld was coming but efi just made it more obvious. That said, I would never go back to a carburetor or even waste time rebuilding one. If you have a carb on it and it's running good then I would leave it on but I would begin collecting the parts I want for an EFI setup since it's only a matter of time before that carb has an issue.
