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You don't know how wrong you are by stating that 7x is a niche birding glass,
but the other part of your statement is actually correct.
I have myself little interest in birding and am therefore part of the legion of "others" who, I'm sorry to say, by far outnumber the birding community (not sure whether this will go down very well here..|;|)
As an amateur astronomer, I know that 7x and 10x are still "kings" of mags for handheld astronomy and a new 7x42/50 roof combining pinpoint stars with a super wide FOV (150m or more) would be a massive hit, just like the SV 10x50 is in its category. The only one that gets near to fitting the bill is the Zeiss FL 7x42, but unfortunately it has limited ER (for spectacles weaver) and average edge sharpness.
If you are a customer lambda, you don't know much about binoculars, it's very likely that you will be given a choice of choosing between 8x and 10x without even knowing that 7x could be a better choice for you, it's how bad the situation has become.