3

In almost all microphone designs, it's quite simply because that's the way the diaphragm faces. A hand-held mic has the diaphragm set at 90° to the body, so you point it at the sound. pic: https://www.soundguys.com/shure-sm7b-review-28438/ The standard large diaphragm condenser as in your photos has it in line with the body, so the pickup pattern is ...


2

Record the two mics as two channels. Then you can decide what you want to do when mixing. As this seems to be very uncommon, there probably is a reason. Only way to know for sure is to test it (takes about 15 minutes, so why even ask here? )


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