I will be plastering drywall on the ceiling and walls in rooms with slanted ceilings. I thought I’d check with you if I’ve got everything right

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In the joints, I apply one layer of plaster. Glue a paper tape and then plaster and sand etc. until the surface is smooth and nice.
Then I heard a carpenter say that the joint/gap between the ceiling drywall and the wall should be filled with acrylic caulk, not plaster.
Is everything correct if I go with this?
What do you think about Microlit - is it necessary?
Is it complicated and does it take a long time to install?