The debate would rage for ever about who should handicap the horses and how often changes should be made etc. Each track has a racing secretary and morning line odds maker but neither are likely to be horsemen and since applying ratings to horses has never been done in the US, I can see alot of trouble.
I cannot imagine (say) Rick Dutrow or similar trainers being happy to be told that their horse rates a 90 and thus must compete at a certain level, especially if the guy in question has never so much as petted a horse! . Alot of these guys are buying and dropping stock to win. It also means that moving a horse an owner no longer wants is a problem. Alot of trainers/owners deal in certain types of horses. In NY, Nick Zito and Bob LaPenta focus primarily on stakes races. If a 3yo goes through the early season events and proves unworthy of stakes racing, they are usually dropped in for a tag at belmont in July and are quickly snapped up by someone who deals in lesser stock. “One man’s floor is another man’s ceiling” as the theory goes. This system allows LaPenta to move out horses to make room for his new crop of young prospects.
Without a claiming system, these guys (and others who want to move horses) are stuck with what they have. If an owner is stuck paying bills on non productive horses, he has no money to invest in more horses and no place to put the new ones. Unless they suddenly institute frequent auctions to premit the transfer of horses it creates a backlog.
I know that the hunter analogy is flawed because hunters are subjective, but at least in theory an AA hunter kicks ass in C shows, each time. Similarly, even a G1 stakes horse could stumble at the gate or lose his rider and thus lose a cheap claiming race. How about we use a GP jumper dropping into local puddle jumpers instead?