This list of thread-safe classes from (last updated 2014(?)) is really old and out of date. For example, NSAppleScript now has mechanisms to be thread-safe with thread-safe OSAXen as of Mac OS X 10.6.
https://developer.apple.com/library/archive/releasenotes/AppleScript/RN-AppleScript/RN-10_6/RN-10_6.html
Is there an updated list of known thread-safe Foundation classes? Especially interested if mutable class clusters got some basic thread-safety or if I still have to use nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpq8mvj8s9nrz7j5zxc0w4w5lary5crfqkx9l7qu5dk8psennqjd7usjvxlnw (nprofile…xlnw) et fam. // nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpq23qufhd0v2d4a9taeg6jhja3p5ev5pd3ym48qulgfgcqayaul0zsfw58t5 (nprofile…58t5)
https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/ThreadSafetySummary.html#//apple_ref/doc/uid/20000736-126010