Actually it’s not useless. Most of the time, of the three variables you can only change 1. By manual piloting, you were able to quickly see if you were lowering you’re targets angular velocity enough to allow your guns to track. You couldn’t change your guns, nor your targets signature (since for most of it’s life Target painters were considered the most useless form of ew - now ecm has that title) so the old tracking number gave you instant feedback on the results of your actions - it’s why many of us have angular velocity selected as an overview column.
While I agree multiplying by 1000 or 100 is child’s play, I don’t have my x325 tables memorized. While I agree the new number makes is very easy to compare guns. It does not directly tell me if my 425’s can track that frigate as we’re both maneuvering (we now use, “if I get down to this…”). It doesn’t matter in the end, what’s done is done. I’m sure the OP will learn the new system.