Here's another item that's not been mentioned - saddle setback. An initial fit might be done using the traditional KOP method, but that doesn't mean it's ideal. I tend to place my saddle up to 20mm further back. When I do that, it helps with climbing and takes weight off my hands, which is important when using a 10cm saddle to bar drop. It also increases the total reach to the bars, so suddenly my supposedly too small frame has as much reach as a bike that's two sizes larger, with the saddle set by KOP.

The frame size that I ride might seem too small at first glance, but isn't, once you know all of the facts. Even with my short torso, I use a 110mm stem and have no knee to elbow overlap when pedaling in the drops. My current frames have the smallest stack height I've ever used, at 505mm, but I've got 20mm of headset top cover and spacer, plus a -7 stem, so it comes out with the desired saddle to bar drop. This was all planned carefully before ordering Yoeleo frames with integrated bar/stem. You can't change the stem angle. There were no surprises.