I am not editing a structured text file on my phone while out and about.

Especially due to the error-prone-ness and slowness of using mobile screen keyboards, you need guided/assisted data entry; a number pad only when you need to enter numbers or dates. A "use today's date if blank" field, selectors for accounts and tags, etc.

Yeah any text editor would be fine which is what's great about PTA but editing text on a phone isn't great. That app looks like it might be what I'm looking for so I'll have a look at that thanks