I am not a fan of disc brakes for gravel/ endurance bikes, and am therefore frustrated that all of the sweet new steel gravel frames (that fit wider tires) are disc only! I guess I am a retro-grouch because I prefer my CX bike with TRP RevoX cantilever brakes. I am a big guy 6'-4" and over 220 lbs, and never had trouble stopping myself with cantilever brakes while riding cyclocross or gravel. Disc brakes are great for mountain bikes, but are such a hassle to set up properly and are way heavier than canti's.
For a short time, I had a Soma Wolverine with a nice steel front fork; the only problem was whenever I turned the brake rotor would rub against the caliper. I guess the fork was too flexible for my weight. So I just put 40c tires on my 2012 Van Dessel Gin & Trombones cyclocross bike, and call that my gravel bike. The Van Dessel has both canti studs as well as a disc mount on the frame. For awhile I thought about "upgrading" to discs, but I don't think I ever will. If its not broke, don't fix it, right?
I just wish that there was a Ritchey Swiss Cross (cantilever) equivalent steel frame that can fit 700x45c tires.