Which force your to bring your unit out of range instead of moving it await from their initial position. Mortars or pakhowitzers and such are pleased to know you just need to move them out of lefh range once they fire their barrage for safety.
Could you actually run some tests instead of just reacting sarcastically?

In both scenarios the turned around LeFH (vet 1, no rotation bonus) starts firing as the Pack Howitzer and mortar finish their barrage and they are able to move out of the barraged area as the shells start coming in.
Mortars and the Pack Howitzer their barrages take so long that a turned around LeFH will still start firing as they finish their barrage or right after. Especially once the LeFH has the vet 2 rotation speed bonus. Again, the "tracking" doesn't change anything here and is next to pointless. Using the opposite facing as you suggest actually makes it worse here.
Counter Barrage is a valid concern/discussion, but this "tracking" premise presented in the OP is blown out of proportion and a total non issue in most if not all in game scenarios.