You provide an interesting reflection on workflows Ton.
Personally, I spend so much of my writing of late on my Nexus 6P. For longer posts, I still often start in Trello using Markdown, however for my collected posts I utilise the post editor. Although I have tinkered with Indigenous, I have become particular about the structure of my posts, especially my use of titles and emojis. I also like to add links between different posts.
I imagine there are probably other things that I could do to improve my mobile workflow, it is something of an itch. However, for now it works.