I also use it every day. It does its job, but it has many usability issues that make it less than ideal.
For example, copy and paste retains the text color (probably by design). So, sometimes I get black text on a black background, when the app is in dark mode.
The editing process to remove the formatting is pretty annoying.
It takes me time to find the edit button, which is buried in the menu but prominent in the desktop version. Then, I have to toggle the HTML mode and delete the retained tags, which on a phone takes time. The desktop version, instead, has a button to remove all formatting.
Ah I see. I very rarely edit or create cards on mobile so for me it’s mostly a card review app.
The App uses the Mac Text element rather than a custom one, so it'll have the same shortcuts as all of them; `⇧ Shift ⌥ Option ⌘ Command V` to paste and match the formatting of the current field (in the case of a blank field, remove formatting).
Try pasting into an app/textbox that doesn't support any formatting then copy/paste from there.