Cathy’s response is totally correct, and…
No, there are no immediate rewards to moving to UXP right now. However, CEP is already being deprecated across Adobe’s applications, and UXP is definitely the future.
Trying UXP now, and making us aware of what you think is missing or necessary, is the best approach to making sure that, on the day that CEP does get officially deprecated in PPro (no dates yet!), you will already be familiar with UXP…and hopefully, almost done porting your previous CEP+ExtendScript extensions, to UXP plugins.