Just my quick two cents worth, I've always looked at the smoke locations as a representation of a combination of all the spotting devices and factors at work. CB in WWII while getting more scientific was still an art to some degree. If the enemy or indeed yourself unmasks the guns, so to speak, as a Commander you still must decide whether to utilize your artillery resources to CB those positions. Again a bunch of considerations must go into this decision.
Oh one more thing, the artillery piece sometimes showing up under the smoke, only shows that the reports going up the chain would at least ID the type and size of fire. Veterans would for the most part be able to know what is hitting them sometimes even before the first round hits in their location.
IMHO the way things are is great.
Bob out