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It already exist, lower end Trek Madone frame for instance have hidden mount for mudguard.
'course, they stopped making the Madone and only have two model, the high end and the cheap alu, only the latter have hidden mount.
Quite like the GT Grade that's billed as a gravel grinder, but the super slack very high trail geometry a little off putting despite generous clearances for mudguard and fatties.
I'm in the market for a new roadbiek next year, so am hoping that my default preference of 'something dull with mudguard clearance' will either become fashionable, or perhaps simply transcend fashion altogether