If this is conclusion of mine is correct(?), that means: even less motivation for modern Ubuntu versions to include proprietary blobs.
However, on other issues internal flash means the controller is more expensive and more difficult to update on bugs or security issues, so putting firmware on in the filesystem makes it much more visible, easier to manage and cost-effective. This is not possible for many controllers, like the boot rom, keyboard, touchscreen, hdd/ssd controller, because they are needed to work before there is a filesystem available in many cases. But in case of Wifi and Bluetooth, doing it like this is possible and preferred for most people I guess.
Of course many people would prefer having only FOSS firmware, but even in that case they would prefer having as much firmware as possible visible on the filesystem instead of hidden away on some flash for those reasons.