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...