Thank you sir. I'm still a bit foggy on exactly what a "fixed crawl" is...
This is the fixed crawl on my hunting bow:
The orange nock is the top nock. The black nock that extends for about 3/4” is the lower nock. The arrow goes between the two nocks, and the string is held below the lower fixed crawl nock. The shooter draws the bow to his normal anchor, which positions the arrow closer to the eye than it would be using normal nocks. The closer the arrow is to the eye, the closer the point-on distance is to the shooter.
The point on distance is the distance where the point of the arrow can be placed on the spot to be hit when gap shooting, rather than above or below the spot to be hit. When using a fixed crawl, the point on is set right in the middle of the distance the shooter expects to shoot when hunting. I construct my fixed crawl so my point on is 20 yards, giving me good hunting accuracy from 15-25 yards. This enables me to be more accurate and to think less about aiming when hunting.
The downsides of using a fixed crawl are that the bow must be held upright, or at least close to upright, when hunting. In certain hunting situations this could be limiting, when a cant is needed to shoot under limbs or through a hole in bushes, etc. The fixed crawl is not allowed in most tournaments, and would be of only limited use there anyway, as many shots are outside the 15-25 yard optimal range. It is likely that you will be offered a friend's bow to shoot, or want to shoot a bow for sale somewhere, and it won't have a fixed crawl, making those situations awkward unless you also are comfortable shooting without a fixed crawl. It's kind of like only learning to drive with an automatic transmission; it limits the driver's options.
I only shoot my hunting bow with a fixed crawl, in an effort to avoid confusing myself in a hunting situation (I confuse easily). I only shoot my target bow with normal nocks, because I like to shoot in tournaments and see very little use for a fixed crawl when target shooting anyway.