Charlie Sisk opines that the CZ trigger mechanism is very complicated and has lots of parts. Otherwise great rifles
No direct experience there, but he certainly has lots of experience with various actions.
That is my opinion as well, which I wrote about. My 416 Rigby CZ has a NECG two pivot trigger mechanism that was designed for a M-98 Mauser and which is totally encased in a steel enclosure.
That said, the CZ 550, trigger and all, have a stellar reputaion for reliability and dependability here as well as in Africa so some of this is rifle looneys straining at nats.