This is a big reason I only grade assessments. Otherwise, grading is overwhelming. I also give thorough, actionable feedback, which the kids appreciate. If they pressure me to grade faster, I remind them how much work it is to write that type of feedback. And the closed gradebook helps.
A student is absent for whatever reason, say sports, or illness and they need to make up some work.
They take awhile to make it up, and then complete the work. Their parents want their grade immediately updated and they do too.
You have 180 students, so that's not possible. What happens?