Good content, Ben. I have limited experience with other bikes, but would second the Spesh Roubaix. SL8 with 40mm clearance is great, but I actually use my SL5 (2018, first gen with future shock) on both road and gravel. 700cx28 wheelset for the road, and for gravel I run 650b wheels with a 43mm GKSK front and 38mm GKSS back. The frame only clears 700x32 radially, but with smaller diameter wheels there is enough lateral clearance for the sizes above. And because the rolling diameter of the front is equivalent to 700x23 (before squish), it handles super sharp. Very easy to point down twisty single track. I don’t ride chunky gravel, so this is as much tire width as I need. YMMV. Oh, and the future shock is a big bonus off-road too.