@3x5 Just to clarify: UBports is the name of the community. The OS is called Ubuntu Touch because it is based on Ubuntu, well, actually in many ways, it is Ubuntu, but then slimmed down to run on a mobile device.
One thing that is front and center though, is, as you've experienced, making the phone experience the best it can be on a phone, and the tablet experience the best it can be on a tablet.
Desktop applications (I prefer to use that term, rather than 'legacy') were only ever meant to shine being used as they were originally intended. Slap on a keyboard, mouse and external monitor and your gmusicbrowser would be much more pleasant to work with. Only thing is, it would not be very 'mobile'.
Maybe encourage the developers of gmusicbrowser to make their application adaptive to smaller screens. Does it already do so?
Why Morph is labeled as a legacy app in the logs is a mystery to me, as it is one of the applications that most showcases the intent of the OS, to provide one platform for different form factors, with applications that are 'convergent', i.e. look like they belong across different screen sizes and device configurations.