Tbf, isn't that the point of Paradox Interactive games?
Anyway, my two cents: First off, the HYW was a dynastic, not national conflict; the Plantagenets were fighting to reinforce their dynastic claim on the French crown, not to establish a super-England from the Firth of Forth to the Mediterranean. In fact many of Europe's conflicts would remain dynastic in nature even arguably up to WWI, with stuff like nation-states coming later into the picture. Second, wouldn't the higher prestige of the French crown make it the dominant partner eventually? England was a relative backwater while France could trace its royal title all the way back to Charlemagne.