Incrementing and decrementing text quickly and easily (by reasonable increments) is table stakes to compete with Sketch and the like.
Requested UX:
1: add the ability to use the UP and DOWN keys while focues in the text size input to increment and decrement text size 2: add the ability to click into the text size input and use the arrow up/down to increase the text by 1 unit, and holding the ctrl/cmd key to change the size by 10 units.
3: change the text size>bigger and size>smaller, and precise>bigger and precise>smaller shortcut keys to follow the 1 unit and 10 unit pattern described above instead of the odd increments it uses right now.
This ability is a great productivity booster for UI design. Sketch has great UX in these regards.