Dzus fasteners are captive but need only 1/4 turn to open. Very normal for light aircraft engine covers since ancient times
My current Novatec PC has two specially knurled capped screws to release a side panel and full access to the innards. So easy and nothing hidden.
Early PCs often had an inverted U-shaped lid and two sides in steel, almost guaranteed to need 3 hands and be oblivious to the pain of pinched fingers. It often needed a small sack of screws to open/close properly.
Worst, though a Mac engineer, near wrecked an HP PC failing to open its case and muttering about a missing key.
After the event I pulled the front off and turned some clip or other. I had to make up replacement bits of plastic to allow the start and reboot buttons to work.
He could be excused because he was only trying to help my (G.Designer) daughter with her son's problem PC
He had a maintenance contract with her and all his expertise was Mac orientated.