This seems like a really interesting combination, and I really want to see if I can get my hands on a review unit.
If all your references to those other masters have been removed, it will safely remove those masters. Developers are rapidly populating Plasma Mobile with essential programs, such as web browsers, clocks, calendars, weather apps and games, all of which are being deployed on all platforms, regardless of the layout. Instead of using GECK for this, load your plugin into 圎dit and use the 'Clean Masters' function by right-clicking on your plugin and selecting that option from the resulting 'context menu'. Thanks to projects like Kirigami and Maui, developers can write apps that, not only run in multiple environments but that also gracefully adapt by growing into landscape format when displayed on workstation screen and shrinking to portrait mode on phones.
The same underlying technologies drive both environments and apps like KDE Connect that lets you connect phones and desktops, the Okular document reader, the VVave music player, and others, are available on both desktop and mobile.
Plasma Mobile is a direct descendant from KDE’s successful Plasma desktop.
You can follow the progress of the development of apps and features in the Plasma Mobile blog. The PinePhone – KDE Community edition includes most of the essential features a smartphone user would expect and its functionalities increase day by day.