Writing tuplets is as simple as typing the ratio 17:16 and press return - all very neatly proportioned.
The point about the tuplets is not that it's not easy to get 17:16 in there in the first instance, but what happens when making a change to the tuplet ratio afterwards, having just put all those notes in. If I want to use that same note sequence and turn it into a 19:16 for example, that's where things start getting inefficient. Even in Mosaic the tuplet could be deleted and the note row would remain making it quick and easy to turn into a tuplet of another value.
Anyway, hopes of this little detail being improved are receding...
you can't please all of the people all of the time. The majority of people using notation software (your keen amateurs) do want to have accurate play back which wouldn't work the way you suggest in Mosaic. There's always been a tension between good looking notation and decent play back.
