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Because it is a smaller share of traffic, so it is deprioritised entirely. That is reasonable arithmetic and it means half the diagnostic signal is discarded.
Bing impressions, clicks and positions attach to the same page record as everything else.
Bing data lands per URL alongside Google's. Both are shown together, so divergence is visible rather than requiring somebody to open a second tool and remember what the first said.
A page ranks third on Bing and eleventh on Google for the same cluster. That gap is a signal about the page's authority rather than its content, which changes what you do about it.
It will not be a traffic strategy on its own. For most businesses it is a diagnostic input; Growth presents it as one rather than inflating its importance.
The page record, its cluster, and the technical issues found on it.
Yes, and combined where you want a total.
Where the engine reports it, yes, labelled as such.
No. Growth works without it, with the gap noted.
Fourteen days, every module, no card. Or half an hour with someone who will run it on your own records and tell you where it does not help.