If the stopwatch timer didn't record time properly, I'd see where you're coming from. UI polish isn't going to make fix an error in the timer. But here, all the core functionality works, the clocks show the right time, the stopwatch starts and stops. The main complaint here is about the colour of the buttons, which I agree could do with some polish.
I've just installed the update, and the inconsistency between the countdown timer start button and the stopwatch start button are probably deliberate. I didn't think about it at the time, but starting and stopping a stopwatch should have as precise a timing as possible, adding a fuzz of a "pressed" state for buttons which can respond instantly will reduce accuracy of the stopwatch. But for the countdown timer, accuracy doesn't matter so much, and these buttons work like normal ones, with a pressed state.
So, rather than evidence of bad design, this could be evidence of good design.
