I would think the reason 2x10 stand alone cabs are so few in number is that if you are going to make a cab/head amp configuration then going for a larger speaker was the preferred choice. moves more air and without the amp chassis and heavy transformers of a combo it was no real burden to use larger speakers whicvh weigh more than tens.
There are no shortage of 2x10 combos however as this was a good compromise between weight and how much air you could move with two speakers and still have a relatively compact package.
Probably 2x10 cabs are somewhat overlooked as an option other than extension cabs to mate up with a 2x10 combo.
Seems to me there were plenty 2x10 speakers for PA back in the day but I might be wrong... those would use a more wide range speaker , maybe with a center mount tweeter or in conjunction with a set of tweeters for high range and maybe woofers for bass for full range repro of sound unlike instrumental amps where you were looking for something more tailored to the instrument.
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