I need to throw this in about the lower BB height. When I design a bike the stand over height is a consideration. Knowing that a bike is to be outfitted with 32-40c tires I drop the BB down a centimeter or more to accommodate the appropriate stand over height for the proposed rider. Not convinced the lower BB was intentional for stability, rather I believe it is for stand over height, but the bike companies needed a way to differentiate product and fit the marketing bill for gravel bikes and use "stability" as part of the campaign to sell.