Having lived in Japan, and having been a major Japanese camera brand ambassador, I think you might be slightly misinterpreting Fuji's obligations here. Kaizen (Japanese: 改善, "improvement") is a CONCEPT. It does not refer to firmware updates. It primarily refers to business activities that continuously improve all functions and involve all employees from the CEO to the assembly line workers. It's more about process than product, although improving the product is always a goal too - one which most Japanese companies pursue when building the next model.

While there are certainly elements of Kaizen involved in the decision to update firmware, your expectations may not be in line with what the company sees as its obligations. I too wish for more firmware updates, but I expect the camera I buy (Fuji X100V for me) to perform the way they advertised it on the day I bought it. I personally do not feel like I am entitled to anything more. If I get it, I'm happy about it. If not, I don't feel like I have any grounds to complain.

There are also things that cannot be updated by firmware but that some photographers think SHOULD be. For example. Olympus introduced a feature in some of its cameras that allowed autofocus to specifically track birds in flight via AI. But it required the camera to have a certain sensor. Older cameras could never be updated with this capability because their readout speeds are too slow. Yet, some photographers complained when their camera couldn't get an update with that feature.

I only write this comment to share a different perspective - not to criticize. Thank you.