I have been both teacher and student. As a teacher I go to a great deal of trouble to write a complete list of supplies and find only half the people taking the class have actually read the list. It's frustrating to all when they don't have the necessary items to complete the class and ask to borrow or use someone else's items. I understand the need to be flexible with time, as some students learn more quickly than others. And am always happy to work more one on one to help them complete the project. I have had people attend my classes without bringing equipment required and have no issues if they learn best this way. But also have noted those that do so, seem to expect more information or clarification than if they actually completed the class as listed. This takes time away from other students.
As a student, I bring the requested items and arrive early to be set up and ready to begin at the appointed time. It's annoying to both instructor and other students when you come in late or right at the class time and have to get everything out and ready. Since I learn best by hands on method, this is how I prepare to take the class. I prefer to listen to the instructor and if I have a question ask the instructor not my neighbor. I have been know to change seats when my table partner kept asking me for assistance making me miss important instructions. If I could learn by just watching, I see no problem doing it that way if I have paid for the class.
Just me two cents for what it's worth:-)