Although I am not a mechanic, I can say that this is an engineering issue to cancel or add a system on the current system. If something is used there should be a reason to solve a problem or something during the R&D period.
And also we know that, Honda engineers have cancelled some systems on the engine during the years 88-92, but not on the later models.
You should use the service manual to perform the checks, so that you can understand the system is functioning or not within the design parameters. Otherwise it will be a never ending learning project.
By the way there was a project to convert the carb to injector system, if you want to read. But unfortunately the pictures can not be seen anymore.