“why are there carbs on the Ninja when the Hyosung is fuel injected?”
For the same reason that most automobiles have been running the same engine blocks for 20 year stretches at a time. Its easier to improve small cheaper aspects then it is to re tool a whole system.
Hyosung has something to prove and needs to add every upgraded anything they can to throw in there…never mind quality should be their first priority…but hey if you add enough bling, no starts might not be a big issue.
Kawi is an established company and only needs to improve just enough on their entry levels to keep things interesting. My V900 and my V500 were and are FI. Though the 500 got squashed. They were aiming for a more popular cc size riding group with the bigger 2 so it made sense to upgrade the fuel system. Below that and your in a niche market for what is likely “Lil Runarounds” and not expected for a long haul needing good fuel management.