I went to composition school in the 90s and had a full load of comtemporary comp, post-tonal theory and computer music (Csound + Common Music were the core tools) so I've spend a lot of time in the world of Asher's talk here. Ferneyhough didn't hook me as much as Xenakis did - he and Ligeti were my big contemporary classical influences from early on. But i have a healthy variety of musical personas.
There are so many links and citations this makes me think of sharing, and I'm not sure how many others are interested in this intersection of music / architecture / modeling / systems thinking, but I have gotten sucked into this thread on lines every week or so for months:
https://llllllll.co/t/experimental-music-notation-resources/149
I love the variety in how people notate what they hear in their heads, and how they organize and model it in the process.