BTW, this LWN article covering a talk by Dirk Hondel at the LCA 2019 nicely describes the design choices made for the multi-platform "Subsurface" diving application, e.g. resulting in the use of QML and Kirigami.
Side note: "Subsurface" is a hobby project by Linus Torvalds, Dirk Hondel (VMware's chief Open Source officer, formerly chief of Intel's OSTC) and others.

IMO interesting background information to read as a Pure Maps user or developer, and good to know that at least a third application also chose the same approach: OpenOrienteering Mapper