It is quite common to find device manufacturers, even those of many years standing, who _appear to_ begin with the device and add the software as an afterthought. Paying little attention to security or even the software lifecycle (patches, updates, the changing landscape/ecosystem). I have even known it happen that the device brand subs out the software to a random small developer, who then closes up shop/dies/gets out of that business, and the device company doesnt even have the source code, let alone any ability to further improve/fix the software that drives their device. This leads to layers upon layers of subsequent middleware, UIs, shims etc.