I don't think Android has any inherent advantage over regular Linux for a bench scope. Other than initial ease of development and abundance of developpers for the platform.
Once you have an estabilished platform and software crew, the advantages stop.
The market has a lot more Android developers.
It allows them to use a higher level language (Kotlin), which speeds up your development significantly.
The UI on Android is years beyond Linux.
Android is getting constant investment with enormous amounts of financial investment, hyper focused on the UI.
Both are Linux kernels underneath, but Linux has very weak UIs and UI tooling.
On Linux there is very little investment in their UI because there is no market for it, desktop Linux is really small.
The Linux market is server.
Since Android is hyper focused on UI it has a large amount of ongoing investment.
Additionally you can use mobile chips and their GPUs for rendering on Android and leverage what is around since, again that is a large portion of what Android is about.
And since most of these scope companies probably want to focus on the hardware and low level parts of the scope, it would be great to offload a lot of the UI and get improvements in UI without needing to spend any money on it at all.
The UI of a scope is a pretty significant part of the experience and the fact that a lot of scopes have dog slow UIs and the UI slows down when there is a lot of action tells me there is an opportunity to build a much better product at a significantly reduced cost.