A lot of these suggestions I can get behind, but the tire widths suggested call for chainstays longer than 420mm.
To me 420mm is really the max for a race oriented or " fast and nimble" gravel bike. I do think there is a noticeable difference between the old 3T Exploro and the Open U.P. for example. But if+ 50mm tires are possible with short chainstays, go for it.