I bought a 2019 Giant Revolt gravel bike back in March. It had a propriety brake system on it that had a box in front of the stem where the mechanical brake cable went in from the lever and the hydraulic cable came out down to the brake. It bolted into the stem; strange set up! I couldn't get a small enough stem to make the bike fit, so I sold it & ordered a 2020 Giant Revolt that came with a full hydraulic brake set up.
After nearly 2.5 months of waiting she came in last week! I still need to switch out the handlebars to the ones I prefer. So far the fit is good. I hope to get some gravel miles on her after cyclocross season.