I wanted a flatbar gravel bike for bad roads and easy singletrack. I have short legs, and having passed the age of Medicare, my once-impressive flexibility isn't what it was. For those awkward mounts and dismounts when that easy singletrack isn't quite as easy as I had thought it was, I wanted one with a relatively low standover height, 700 mm or less. (Curiously, both Marin and Salsa had several models that met my spec on their web sites, but they didn't seem to exist in real life - nobody could get one in stock in the Denver-Boulder area where there are approximately 83 million cyclists and 400,000 bike shops.)
The solution was to buy the Low-Kicker frame with its 600 mm standover and have a local bike shop (Treehouse Cyclery in Denver) build it for me with:
Shimano Cues 1x10 drive train, 40/11-48, 170 mm cranks
Tiagra mechanical disk brakes
Jones Loop handlebars
VO Sabot platform pedals
For now, I have Kenda Drumlin 27.5x1.75 tube tires, but they are sort of heavy and I may switch to wider tubeless tires some time.
After a dozen or so rides, I have things dialed in, and I'm pretty happy with it. I can't claim I have the expertise to judge that it's better or any worse than any other steel frame for comfort and handling, but it works for me.
A minor issue: on the size medium frame with 27.5x1.75 tires, you may find that your size 9.5 shoes hit the front fender if pedaling while cornering. (The center-to-center dimension from the bottom bracket to the front axle is shorter than on any of the five 26" or 700c bikes in our fleet.) For this reason, I got the sort of mud guard that clips to the down tube instead of a regular front fender. If you get the smallest frame and want fenders, consider building it for 26" wheels.