I think you will find that the 13" models are considered “better than average” performance because they have quite premium motherboards in line with the high end build quality.
As somebody who has been agitating for a chassis deep enough to house a hand-built keyboard ad-nauseam, I think if somebody designed a laptop with a little extra depth to accommodate Cherry’s ULP range of laptop switches and the slightly bigger screen you wanted, it would nicely fit both our desires.
Of course this proposed laptop would just happen to take advantage of the frequently-refreshed FW motherboard (I suggest the 13 would be sufficient) and other components, but might prove more powerful due to a more spacious case to improve cooling. It may fit a bigger battery too.