The Approval category was created for maps that had too much score gain so they wouldn't break the rankings, it was never intended for such mapsets to have only hard difficulties, this was for Marathon difficulties only due to their length, but mappers abused this fact by making maps overinsane so it would break the score limit and be able to go with 1 difficulty only.
How it was supposed to work: Marathon Length = 1 diff minimum, no need for easy. Breaks score limit = Make lower difficulties, have a hybrid (ranked with approved diffs) mapset.
Max score is irrelevant nowadays so only long mapsets go for approval now or gimmick maps like ziin's Blythe.
Mappers that decide to take on the challenge to map long songs that don't fit with the Marathon length should be ready to have to work harder to get their mapset ranked, you can always ask modders to only mod part of the mapset (except for MATs and BATs) so that it doesn't become too long for them in the modding queues.
Now hope you understand, but this will not be changing.
How it was supposed to work: Marathon Length = 1 diff minimum, no need for easy. Breaks score limit = Make lower difficulties, have a hybrid (ranked with approved diffs) mapset.
Max score is irrelevant nowadays so only long mapsets go for approval now or gimmick maps like ziin's Blythe.
Mappers that decide to take on the challenge to map long songs that don't fit with the Marathon length should be ready to have to work harder to get their mapset ranked, you can always ask modders to only mod part of the mapset (except for MATs and BATs) so that it doesn't become too long for them in the modding queues.
Now hope you understand, but this will not be changing.