Oh yes, the webcam feature definitely exists and sucks. A lot.
I have to use LockDown + Webcam for my physics exams, which are very heavy on solving equations on your own paper. It works mostly fine until it notices that I'm looking at the paper, then slaps a blue splash page over my screen saying "hey we can't see your face you filthy cheater, show us your face." Happened at least 10 times on one exam.
With webcam exams I feel almost obligated to find a private space to take it outside of my room because you're not 'supposed' to have anything in the background of your video and that would be an unfair imposition on my roommate since he has to deal with the same crap. Fortunately my residence hall has study rooms I can use.
Everyone hates LockDown. When I just had one laptop (a MacBook), there was a 50% chance it would lock up the entire laptop after launching the software, requiring a hard reset. I currently run it in a separate user account on a separate (Windows) machine. I have an iPad, and I'm honestly 100% ok running it on there but turns out some professors disable the iPad app for no reason and sometimes it just doesn't work.
I definitely appreciate the exam guidelines you posted and agree with them. Funny enough, that physics class I mentioned also does the "set time exams" where everyone starts at 4pm. You're entirely SOL if you can't procure a working laptop that will comply with LockDown if yours isn't working.
Fortunately not all instructors use LockDown here, some ask you to join a Zoom call while you're taking the exam (which I think is mostly fair) and some just post the exam as a regular Canvas quiz with varying security settings.
Personally, I think the only form of "cheating" that should be actively seeked out is that students work alone and are submitting their own exam (that is, I should not be paying someone else to take my exam). There are few situations in which you do not have access to the internet and exams should honestly be written in such a way that internet access shouldn't completely break them.