Steel bikes of great repute have used the same fork across the size range, so metal doesn't equate with best design. Sometimes it's about cost to manufacture. Which is also why small road bikes are made with wheels that are too large to accommodate the short reach that small riders often like (without toe overlap). Relaxing the head angle and increasing the rake is a classic method to reduce top tube length, just to the point before toe overlap. Many small riders feel that these designs tend to steer "chopper like" with a lot of flop.

Carbon forks can (and you say so) be made in a number of rakes for a given A-C but are not because of cost VS benefit. Steering response is not really a measurable dimension that can be marketed (as weight or stiffness is) but a vague description at best (much like describing color). IMO most buyers don't understand most of what we talk about here and instead are herded to a bike with all the buzz words, in a color they like and at a price they can pay. That the fork is carbon is the deal breaker and not which rake it has. Andy