The discussion is once again steering back to " Winning ". For the sake of repeating myself, it is not the emphasis of Cat 5 racing. Nor should it be.
A triathlete crossing over to road racing does not result in a rider that anyone wants to be near. Simply because the required skills of pack riding are absent. That triathlete is capable of riding away from the field but it's not a drag race.
Cat 5's are similar, some are quite strong and can easily ride away, but the skill set is also absent.

As I understood the implementation of Cat 5 years ago, it was to provide an educationally based Category for new riders/racers. The Cat 4 fields was subject to a high percentage of crashes due to novice riders being thrown in at the deep end and unable to ride amidst a field of 60 to 100.
Many Cat 4's average well over 200+ miles a week in addition to racing full on. That means a peloton that moves and reacts at a level far above the Noobie Cat 5's comfort zone. A rider out of their comfort zone, into a panic mode, unable to or I should say unequipped to confront the challenge is a rider that is dangerous to themselves and everyone around them... It's not personal it's just part of lacking experience in a sport where the missing elements can and will be chaotic. Thus due to a large amount of complaints and mishaps, USAC introduced the Cat 5 group.
Thereby creating an intro Category, with a much lower entry fee scale, a much reduced race distance, max field limit at a reasonable limit.
That means a new racer can enter and race and decide wether this is for them or not. there is a much lower pressure and if the emphasis is taken off winning then the learning aspects and developmental process can be implemented.

The rate of attrition in Cat 5's is high so many don't pursue racing after an initial race. Should USAC have more implementation of programs ?
To me this is really more of a responsibility of the clubs, not the governing body. Cat-5, Cat-4 and to some degree Cat-3 are really about local regional racing rather than National preparation and the subsequent International exposure. In France, Belgium, Italy, the local clubs organize the regional system. They're overseen by the governing body but the support, mentoring, rider programs are handled by the local clubs. In addition, they all network with each other, which results in a system that is geared towards promoting the sport as a whole rather than individual clubs or teams.