@Boschi64 This probably has more to do with how long it takes to develop a TV-Box (hardware-software). And during this time you don’t do any OS updates at the same time. At first you are happy when you get the box up and running with all its functions.
Now you first change the two predecessors of the TV5 box to Android TV and when that’s done, then you look at the topic of updates. But there must also be a benefit for the developers, because Swisscom then puts its own OS on top of it.