I’m not sure how normal my workflow is, but I try to not mess with as much as I can while writing/recording. It all depends on the style of the music and how much of it I’ve structured ahead of time vs making it up as I go. But, generally, on my first pass through a piece, or a section of a piece, I’m focusing mostly on melody and harmony. I’ll often have tracks recorded that sound like trash mix-wise, but I’m only making sure that they harmonically work together and I’m trusting that I’ll be able to tame the mix later.
But, invariably I’ll find myself running into a point where I’ve got to do at least a rough draft of the dynamics before I can record further parts, because those specific parts depend on fitting in the proper spot expression-wise. And, of course, if the whole piece is an expressive style, I’ll find myself doing that sooner rather than later.
So, generally I try not to focus too much on dynamics and mix until I have to because I know that I can bog myself down in getting the mix just right and never finish the piece. This works pretty well for me, so long as I have the mix that I want in my head while I’m working on it.