I would say it depends what situation you apply the step too and how the step is taken. but generally if your trying to take a step while simultaneousely throwing the right hand then you are going to end up leaving the back foot out of range sometimes by not completing the step with your bac foot before throwing the right, which will result in a weak out of range right hand while if your opponents footing is good then your going to be in range to recieve perhaps damaging attacks but not throw any real damaging ones in return (this isnt good). taking the back foot with you before you throw the right is going to put you in range to land a damaging right hand aswell as recieve one, which is obveousely the desired scenario.
Aswell this will allow greater mobility and economy of energy, as you wont have ended up dropping down into a wider stance which can be draining to be continuousely having to get back out of the hole your putting youself in, in a hurry.
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