Great ratio stat for evaluating a pitcher
HR allowed is currently an available category to use for pitchers, but not HR/9. In head-to-head categories leages, as opposed to points leagues, using HR allowed as a total-sum number inherently incentivizes you to not start pitchers once the team you are playing has given up more Home Runs than you. With HR/9, in categories, a good start from a pitcher would bring down your ratios, and still be effective.
In addition, the HR allowed as a total # causes the league rankings for pitchers to be quite out of wack, heavily trending to mis-represent relievers who of course have lower numbers given their lower workload, and therefore makes it harder for managers as a whole to evaluate trades between Starting Pitchers & other positions.
HR allowed is of course a good stat for points leagues, who can balance it accordingly to their other variables, but it doesn't work effectively as a total-sum number for categories leagues. It is still a valued factor in Baseball to want to use for fantasy, though, and the addition of HR/9 for pitchers for categories leagues to be able to use instead would be the perfect fix for this issue.