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I can see how a given producer might want to cater to a certain user group with some of their eyepiece lines by exploiting FC inherent to eyepiece design in order to produce very high performance in a limited number of telescope designs - as opposed to a product that works OK (but no more) across most scope types. All without calling it specific to this or that, obviously.
However, in practice I have yet to come across a severe mismatch between a quality EP and a quality scope in terms of field curvature! I have seen quite a few combinations now, and none performed so badly as to be worth mentioning. All anecdotal of course, and as my eyes age, I might notice FC more in the future.
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