Apple just dropped version 10.4.2, and while it's a minor update, it fixes two major headaches:
(Introduced in 10.4.1) A new codec for high-performance RAW editing. Final Cut Pro 10.4.2
Final Cut Pro 10.4.2 "incompatible" - Apple Support Community Apple just dropped version 10
Support for high-efficiency video coding and Rec. 2020 High Dynamic Range. Apple just dropped version 10.4.2