guest difficulties would only make it even harder to rank them
here is how modding works:
random modder: oh look a 1:30 minute map for an anime op of an anime I just watched, lets mod it! it's easy for me since it's a short and simple map, just check that it follows distance spacing (zzz) and has correct bpm/offsetp, say +3 offset, nc here, add clap here, free kd yay
oh look a 3:00~4:00 minute long map for approval with complex patterns and a unique distinctive style, modding this would be a pain in the ass, /ignore
and then NO MODDING
and then graveyard
welcome to osu mapping: if you want your map to get ranked you need to either
1. map anime ops or short vocaloid songs (and even those only have a 1/20 chance to get ranked, EVER, if you're not a known mapper)
2. have "val" or "dragon" in your name
3. be chinese (dunno about this part it's just like magic)