I only used the "monolithic" term to mean "virtually" seamless (taped and finished). The way you described it....the joints left behind the trim would act as control joints (allowing for expansion and contraction of materials).

I fully understand about the "spacing". Good "heads-up".

I have floor drains. My basement bathroom drains into my septic system....and the sink floor drain/washer floor draingoes to.......well.....lets just say it goes out of my house