These new divisions are random, but so is Level 4.2. Level 1.2 is no more strange to me than 4.2. There are plenty of 6-8 year olds who get a decent back handspring before they have the strength/experience necessary for level 2 stunting (or their gym may only have Mini/Youth 1). Likewise, plenty of younger kids will get a tuck before they're ready for Level 3 stunting. Also, cheerleaders are constantly trying to progress their tumbling skills beyond the level they are currently competing, yet they don't really work on stunting skills that are out of level, which can create situations where their tumbling progresses faster than their stunting.
When the randomness that is Level 4.2 was first implemented, I figured it was only a matter of time before there were more "decimal point divisions". People used to joke about what decimal division would be next (why not 3.2?) All the decimal divisions would make sense in a way, but they of course would also add to the division/crossover madness that already exists in the sport.
As for "Level 5X"-- in a way, it makes sense. Having boys tumble under the same rules as girls has always seemed a bit restrictive. Boys are built differently-- a triple full might be easy for a boy whereas it would be a complete rarity for a girl to have a fully rotated one. On the other hand, given the fact that there are large numbers of athletes on the floor simultaneously (and tumbling in close proximity), it does make sense to have restrictions on the skills being thrown, even if the individual athletes can handle more difficulty.
I understand the suggestions of more divisions, but at the same time, cheerleading already has too many divisions lol.