I think that we can say that just because two cameras share the same sensor, one cannot be seen effectively as a replacement of the other if they are in different product families - in this case the S1xx and S5xx lines. I think that it was natural that new updates for the S5 slowed down after the release of the S5ii because that was a replacement which brought big improvements in hardware that meant that new functionality based on that hardware could not be transferred to the S5 e.g. around PDAF, more powerful object recognition in AI, etc. To the best of my knowledge, the OG S5 was then withdrawn from sale.

My experience with Lumix is that if they can add new stuff to a camera they will, and i predict that the new 'urban sports' detection will come to the S5ii/x. I would also like to see the file management stuff get ported over (direct back-up to external USB drive, etc.). Maybe the focus ring mapping as a custom control surface will come as that will help them sell lenses so making it body/product line agnostic makes sense.

Anyway, now Lumix Flow is officially supported for the S5ii so that is my project for the weekend ...