When your top play is an easy, insanes are still something you'll have less success on within a month of playing compared to someone who works his way through star increments(according to ranking critera, insane ist 3.75-5.25, median would be 4.5 which is arguably not playable by a newb)
You might get some good scores with decent acc on certain maps you practised a lot but your consistency through a large variety of maps and mapping styles will be a lot worse, especially if it comes down to AR 9 vs lower ARs(depending on what you focused on the switch in either direction is hard)
I mean, i'm a bad player and depending on how well the map fits my inexisting qualities I can get up to 80% acc on a sightread on a 4.5 star map even though what i'm playing on average is 1 full star below(not much less than the difference of hardest easy to easiest hard).