I'm also going to strategically dismiss it going to plan 9, to Pick system, to DOS, to OS/2, to solaris, to PRIMOS, to AMIGA OS, to automobile firmware, as all have equal weight and relevance to linux for creative professionals: none.
I guess you missed the MP demo where much the rage was the Mari demo Mari was developed for Linux and Linux only and was being ported to OS X.
When you get into the big cost per seat stuff you find quite a bit of Linux SW
https://www.thefoundry.co.uk/products/mari