Another app that abandoned Android for the same reason is iA Writer. It's a plain text editor and Markdown writing app designed around working with, and linking

Another app that abandoned Android for the same reason is iA Writer. It's a plain text editor and Markdown writing app designed around working with, and linking among, tons of text files, so it needs to see all text files (and images etc. for linking) in a hierarchy of folders, and be able to edit any of them. Google made it so painful and unreasonably expensive to get that access, they gave up. Now it's a Windows, Mac and iOS exclusive, no Android app anymore, despite it existing and having for over a decade been fully functional.