You still end up with a computer that can perform 3 actions all within the first millisecond of a second and still end up with human-like 180 APM (3 APS), even though no human could replicate what it just did.
How is that any different than someone who goes 100MPH and then 20MPH and claims to have not violated a 65MPH rule because the average speed was 60MPH for the trip?
The units of the measurement do not dictate how the measurement is made.
Because when the cops measure your speed they can do so in an arbitrarily small time period of their choosing, and inertia and power requirements mean you can't be going 1000 MPH one milliseconds and 10 MPH the next.
You could decide to measure APM by saying that the time difference between any two actions extrapolated to sustaining that rate over a minute or seconds couldn't exceed the APM or APS, but as I've explained such a measurement would unfairly give the human player an advantage because humans are capable of bursts they couldn't sustain over longer periods.
