Sure he does, but that's still possible, also tank that needs to stop. Press stop command, not wait until tanks is still, because standing accuracy applies from the moment you press S, not when tank actually stops, meaning you can still have "moving" tank with standing accuracy, you do it fast enough, you're not losing much speed at all and it just happens you have convenient blitz as well at your disposal, OKW blitz makes you more accurate, Ost blitz makes you less likely to get hit.
The fact that one can fire before the tank is stationary does not change the fact that a "gliding" shot tank move slower and depending of acceleration it might never be able to actually reach top speed. It is also much more micro intensive.
Also, moving accuracy is faction trait in this case.
You might just as well suggest that OKW trucks can't be deployed outside of base sector.
Apples oranges.
You described moving accuracy bonus as an "literally no issue", it clearly is an issue.