I think it is something you should work on IF it is not leaving you fully mobile and balanced for both follow up shots and subsequent defense.

Generally, we want to best stance always, and if we disturb that stance (e.g., simply by stepping) then we should return to that best stance at the earliest opportunity.

As to backing up: Do you have a problem when someone is pressuring you and you keep backing? If so, that might be partly due to altering you stance as you retreat OR it might be you alter your stance due to problems you have when under pressure (cause and effect might be unclear but it might be a sign of something you can improve.)

Or if you have no problems, it might not matter (for you.)

The key to improving is to first fix our glaring faults (beginner stuff), then find our biggest remaining weaknesses and locate the cause of those. Fix that until we are spending most of our training time fixing REALLY PICKY DETAILS.

What is the real difference between an expert and an intermediate? Probably the relative size of the faults they are each willing to tolerate or are working to fix.

The Japanese have a word for this process: Kai-Zen == continuous (small) improvements

Fight your strengths. Train your weaknesses.