I used to have about a dozen of them for the Baker... Took up a lot of space in the duffle bag.
I once, regretfully used them on a Hammock tarp in Glencoe. When I returned in gale force winds... The peg held, the line held... The hem of the tarp held, the Reinforced corner guy held... .... Sadly the silnylon didn't hold... This wasn't a cheap tarp (warbonnet Superfly). It was down to the peg and the line being too strong. Stupid mistake
This has to make sense. There is always a weakest link, and it is sensible to have that weakest link where it's going to do the least damage if/when the chain breaks. Two good places for weak links are a slipping line-loc and a pulling peg.
There is a parallel with angling. If the force exerted by a fighting fish is going to overwhelm your tackle, it is preferable that it breaks at or near the hook, rather than further back along the setup which would mean an entire lost line or a snapped rod, or the whole assembly ripped from the holder's grasp, or a man overboard or a capsized boat... Many modern reels have adjustable slipping clutches (known as drags) to obviate the risk - not dissimilar to the slipping line-loc although more sophisticated.
There are also comparable issues which are taken into consideration by condom manufacturers, but somewhat painful to elucidate.
As for pegging angle? 45 degrees of course, whatever the real evidence may prove to the contrary - I'm too stuck in the mud to change.
Great vid btw
@Fossil Bluff - and nice to see a few of 'my' pegs given starring roles.