That could be true. It could also be true that they never thought of the alternate. In my profession we have clients that often say they want one thing, but when you dig a little deeper you find what they really want is something different (sometimes a little and sometimes a lot). That could be true in this case. No reason to shut down other possible solutions IMO.
Also, they mentioned they preferred ASI; however, they are not the player in this case. What is really important is what they and their players are trying to achieve. Is the goal really ASI + Feats, or, as initially stated, simply access to more Feats?