My aural training master used to warn the class that "if you admit the thought of four against seven, or nine against eleven, they'll only ever end up as four and seven, or nine and eleven, against you! - it's four in the time of seven and nine in the time of eleven...". He wasn't wrong. OK, when one gets to be up against the kinds of multiple nested tuplets - especially those which may begin with rests - the disciplines of figuring out how best to present these higher levels of rhythmic complexity can become quite a problem to overcome; whilst this may seem to be the kind of thing that one would only expect to find in certain more recent music, let's not forget the 6 in the time of 7 for which Chopin aks in his Nocturne, Op. 27/2...
Best,
Alistair