it is more on Ubuntu side. Fedora is different branch (rpm package system), while Ubuntu is deb package style. Here Ubuntu Touch is using 'click' packages which is basically deb packages. so still more Ubuntu side than Fedora.

in regards of Android: yes it is using ADB as means to flash (like Lineage OS), but in order to change that, you will have to design such system from scratch and that is not easy for community based project like Ubuntu Touch is.