Yes.
Projection is part of the deal when you sign your life away to be a stage actor.
Not all jobs are on Broadway or on 1st class tours. There are loads of other venues where individual mikes are non-existant. Even if the theatre has stage apron, floor level mikes (or 'mice' as we used to call them), you have to project to get your voice the distance to the mike to get it picked up.
The Grand Manner is done in 3/4 round, and I saw no visible microphones for instance. I also heard every word.
The Cort and the Golden are acoustic gems. Every whisper just floats up into all corners of the house.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher