Though I browse several of this board's forums a couple of times a week, I rarely have the urge to post or respond. I had a rare bit of free time today and got onto this post and read it from beginning to here.
Reading this thread makes me glad I am from the "old school." Since over 90% of my diving during the past 45 years has been solo, my response is not to the op's questions, but instead a response to the litany of responses.
Many of the posts tell me why the manual that came with a lawn mower I bought this past spring--- in around 20 pages---contained only 3 or 4 that dealt with assembly---the rest with cautions and warnings!!! I really did not need to be told not to pick up the mower and use it as a hedge trimmer. That seems to be the theme of some of the posts.
As a solo diver this is somewhat pointless to say---but several of the posters (unnamed of course) in this thread I, to put it politely, would be hesitant to dive with. Rules, guidelines, suggestions, recommendations, etc. should be considered---but in no case should they override common sense---and that's my rub, too many of the posts show a sad lack of common sense and the inability to put things in proper perspective.
However, there were several posters I would dive with, and those I can name: Ana, Slonda828, Walter and Zieg---your posts show, uncommon, common sense and logic and were a refreshing contrast to those from the "Mower Manual" set.