just for the joy of discussion, let’s play this argument a bit further.
Here’s Thomas Adès - Traced Overhead for piano, including the score.
To my ears, the piece sounds like any free-time improvisation or a fluid interpretation of a classically notated work.
The complexity of the notation seems irrelevant to the outcome. What I mean is, you can’t tell that this particular type of notation has been used, because the same musical expression could have been achieved with other simpler means.
Case in point, Chopin’s piano works achieve equal rhythmic complexity merely through interpretation.
The underlying notation is much simpler and easier to read.