What is the proper way to set "Should Move" condition to get out of Idle state

Hi,

In the Third Person Template,
I’m wondering why the condition “Should Move” need, the Acceleration AND the Speed bigger than 0, to be set to true.

On StackOBot only having the Speed > 0 is enough to get out of the Idle State.

What is the value of this extra condition like the acceleration?

Thank you for the help.