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I assumed the discussion was why add the SM7b before the MD421?That's fine, but it has nothing to do with my original post, so I don't even know why you're bringing it up tbh. Whether it is directional or not has nothing to do with how it is commonly used.
The 421 is extremely common for guitars, going right back to the late 60's. For that purpose it's pretty much "the other SM57".
The SM7b is seen as primarily a broadcast and vocal microphone.
Doesn't mean you *can't* use it on guitars of course, but it isn't known for it and for most engineers and producers isn't the first mic you'd go for to put on a guitar cab.
I personally would not use a MD421 in a single mic guitar setup. I would however use a SM7b this way.