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Because it seems Yanks is pretty much needed before almost all of the other modules (listed as a requirement for most of them).
If the module was printed by Avalon Hill (and is not a new edition printed by MMP) then the requirement for Yanks "may" no longer be accurate.
Obviously, you do need Yanks for the Americans.

But Yanks was also where the Chapter E rules and counters were originally published, covering such things as night battles, glider landings, boats, etc. It was Chapter E that made Yanks a requirement for so many other modules, even if they did not include Americans. Now, in the MMP editions, the Chapter E rules are included in the 2nd edition ASL rules, and most of the Chapter E counters are in the 3rd edition Beyond Valor. (I'm not sure that all of the Chapter E counters are in the new Beyond Valor: I don't see any gliders listed on the BV3 counter manifests.)
So, for example, if a module included night battles (but no Americans), the Avalon Hill printing will list Yanks as a requirement... but a MMP reprint will (or should) list Beyond Valor instead.
Yes, this is a confusing state of affairs... and no, I don't know of any list of current module requirements. And for anyone using the first edition of the ASL rules and/or a first edition Beyond Valor, Yanks will continue to be a requirement for many of the other modules.
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Are the boards in Yanks pretty much the only difference from any potential reprint?
Yes, in a straight reprint there would be new SK-style boards, fewer counters, and no Chapter E rules. However, MMP could chose to add additional items to a reprint, as they did with the 3rd edition of Beyond Valor: additional scenarios, and possibly additional maps from discontinued modules.
But, as was mentioned earlier, it will probably be a long time before we see a reprint of Yanks.