Interesting post here about how acting for film is changing.
In the old days (i.e., from the early 1900’s until, like, a few months ago), screenactors would rehearse and then do a "take" (or two or three or 26 takes). The main reason? Celluloid is expensive. And that pressure to "get it right" while the film was rolling resulted in, well, not necessarily the best performances.
With digital filming, there is no celluloid rolling. Rehearsals can be filmed. Different inflections can be tried, and they all make it to the editing stage. In fact, the concept of a "take" is itself become a thing of the past.