lol like you say that website you linked contradicts what you say about line breakage.
probably because they have been testing line using a proper line tester and in proper testing conditions.
companies would not be putting out line if it wasnt professionally tested.
im sure they would end up with all sorts of legal battles.
again if not tested in a proper environment there are a lot of variables.
things like line running through guides under pressure, line being exposed to sunlight,Line touching other line, knot strength, water pressure,drag settings, spool inertia,a rough edge on your guide, reel not properly spooled in the first place, line twist, how the angler fights the fish….the list goes on. this all effects the end breaking strain of your line.
you said "Its much the same as when setting your drag preset weight". id love to know how you set your drags... you would be amazed at how many people set their drags incorrectly, as again there are a lot of variables than can put your drag out quite easily.
there are some very good articles floating around on the net about drag settings. worth a read.
95% of most inshore/bay fisherman will never go close to using there line to even 1/4 of its capacity.
this is why we have drag settings. to prevent line breaking. this is why fishing you never use even close to your rated line breakage point, because tehre are so many variables that can make that line finally break.
you also said"and mind you i was jerking the line like a king would.....so technically it would probably break alot sooner"
thats not an accurate reading as the inertia of movement on the line can cause it to snap with a quick bit of pressure. for an example thats why you have stretch in your line (mono) for certain types of fishing.
your rod and line acts as shock absorption for that reason. and i bet braid was busting alot quicker in this testing scenario as theres no stretch in the line.
90% of the time line is broken it is because the line has either worn down or there has been a problem somewhere along the line. you also do get occasional bad batches of line. i remember a bad batch of stren in 15kg came out that was breaking around 8kgs as tested on a proper line testing machine at broken bay gamefishing club.
its a good experiment to do but i think a better testing environment would give more accurate results.
and if my lines were breaking at those points. id be checking my knots and replacing my line quick smart : )
if we werent confident in todays line, you would all be using 1000pd wire to fish for bream.