I usually use flags (card) when i should be using tags (notes) just because they are easier to use on the fly with one hand (ankidroid) with just 2 taps (1 open flags, 1 select flag)
To tag i have to reach up, search tag (they are ordered alphabetically), reach down and tap ok
My suggestion to improve this and make it 2 taps too are:
- ordered by tags applied, and then by last used
- Remove ok and cancel. Tag and keep the dialog open if you tap on the square (to be able to tap more than one) or tag and close it if you tap on the tag name. Always closing would also work. If you have to add 2 tags, just tap again on the menu
Thanks for reading!