Once a platform achieves performance equaling all that it was designed to provide and the soft/firmware is bug free and stable there’s just no reason to mess with it further.
Although the H-480, with just a few FC and firmware tweaks could do much, much more than it does it pretty much reached a maximum level of performance due to weight limitations. I doubt very many people can find fault with what it does, with the largest complaint likely attributed to inability to load maps and build flight plans. Those limitations are solely due to use of an artificially restricted FC and available memory.
In my mind the big failure has been with the H Plus. Although it can handle a little more wind, has improved stability, and can shoot a great picture, all due to slightly better hardware, the original and current firmware fell and falls well short of what the machine is capable of. As the new H3 is intended to supplant the H Plus I seriously doubt the H Plus will ever achieve the level of performance it could and should have.
What is happening was fairly accurately predicted, and those that could read the writing on the wall avoided both the 520 and H Plus as they were two peas in the same pod. If Yuneec wants to start making money they need to stop upping model version numbers and build just one base platform that employs plug and play accessories. Properly configured, the FC will handle most anything thrown at it. Sell the accessories and accessory operating firmware separately. If you want a mapping drone, buy an H with mapping hardware and software. If you want to map and do cinema work, buy the base platform, applicable accessories and associated firmware. If you need RTK, buy the base platform and add an RTK accessory module and firmware. All the different model releases incurs warehousing and shipping errors, while making the service department more difficult to manage.