They're trying for lock-in and failing.
Linux networking has been a solved problem since just about forever, and all this instability will do is cause people to abandon Ubuntu in favor of something less fickle.
Creating artificial lock-in that doesn't work is a double-barrel footgun blast.
The Ubuntu people are like the SystemD people: they just want to reinvent things from scratch and shove it down everyone's throats without any consideration.
Imagine looking for a Java solution and the only response you find is in Kotlin... fucking annoying as I have to learn Kotlin to convert it to Java... The same thing with network configuration, you're looking for something that works on Debian and you only find a Ubuntu solution....