CLD success package Exercise 13 (Flow rate)

[Madmanguruman]

I am a bit puzzled by the provided solution for the Flow Rate state machine challenge.

The statement in the spec "The flow rate is calculated on one quarter second interval timing" is not followed when the flow rate is adjusted by the slider. This timing is enforced in the Stop Flow logic (there is an explicit 250ms delay in the Stop Flow case) but for normal flow rate increase and decrease, there is no timing whatsoever and a flow rate change of +1 or -1 ramps up and down much faster than the Stop Flow case.

Is this a "deliberately ambiguous" spec item meant to only be interpreted for the Stop Flow case, or did the solution totally miss the mark?