fuel injection is great when its working right. you might as well join
the 21st century and get one with fuel injection. i don't think its
going to go away.

The more integrated the control system, the more clever things can be
done for sure. The best example that I can think of is the way carmakers
are now vastly extending the life of transmissions by having the engine
controller throttle back during every upshift instead of continuing to
dump energy into the clutch packs needlessly. It has the side-effect of
making the shifts smoother as well. The last Chrysler rental car I had
(a 4.0L Pacifica) was obviously using the engine controller to do
RPM-matching during each shift and the shifts were lightning-fast but
very smooth. I was highly impressed. I was even impressed with some
earlier GMs that simply allowed closed-throttle upshift without
RPM-matching, but why stop there?

That said, standalone closed-loop aftermarket EFI with absolutely no
other system integration can be a huge improvement too. A well-tuned
carb can almost match closed-loop EFI in highway driving, but rarely in
stop-and-go driving, through drastic weather changes, etc.

Open-loop aftermarket EFI (like the early Holley Projection) is a way to
drain dollars out of your wallet with absolutely NO benefit over a carb
and a lot of downside.