Because keyboards have the most design inertia of all computer hardware products. The one thing that keyboard makers are loathe to experiment with is the keys. That's why keyboards in 2018 still have a gigantic CAPSLOCK key when it is almost never used. Also why in the age of prosumer hardware you don't see keyboards for programmers with dedicated programming IDE keys, such as a single key to compile. No matter how innovative (or retro) manufacturers in keyboard manufacture nobody wants to experiment with the actual key options that people press.