Evan,
When we used to build engines for my race bikes, around 1998 we started to make as much peak power with EFI as we did with carbs. Of course, we used manifolding that was different and some advances were made in fuel injector design.
With the advances made in ITBs, intake design, and fuel injectors along with much more powerful ECUs and comprehensive sensors than we saw 20 years ago, I don't see any disadvantage to EFI with regards to WOT.
https://youtu.be/CHLB-mkM5qs
I know that a lot more drag racing cars are using EFI these days too.