Studio execs may take comfort in the 2020 WGA agreement's "(a) through (h)" clause, which gives some leeway for a producer or director to cut a script for time, "change technical or stage direction," and most notably, make "casual minor adjustments in dialogue or narration made prior to or during the period of principal photography."
Star Ryan Reynolds is known for working as a writer on the films he produces and stars in (either uncredited, or as in the case of Deadpool 2, credited). Under the current strike rules, while a non-writer director or producer can make small adjustments to the script under the (a) through (h) clause, a writer such as Reynolds would not be allowed to.
Fede is Director and screenwriter. Like director Small changes yes can BUT like screenwriter he NOT can.
My doubt is only director can o director/screenwriter too like Fede.
But is problematic too small changes. Need in hypotetic case changes big or medium no can...