1) It's uncharitable to people who studied for the LSAT under the previous policy, which made people think they had an unlimited number of takes and basically encouraged people to prematurely take the real LSAT. The new policy limits your takes and leaves you a bit more apprehensive about taking it before you're ready.

2) A lot of people are basically winging their preps and figuring things out on the fly. Not everyone has the money for expensive tutors, in-person prep courses, etc. It makes it a bit harder to reach your potential when you're doing it all on your own, and a lot of it ends up coming down to trial and error. It's not so easy to get your best possible score on your first attempt when you don't have a tutor etc. laying out the best path for you. Judging people by how many takes it took them to get a score with which they were happy just further limits entry into the field for people from less advantageous backgrounds.