Whilst I agree with your thoughts on weaknesses created by 'over-engineering' rigs (my first thought is always ... do I really need it?), I don't fully agree on your thoughts/doubts re. braid, especially re. knot sensitivity. Whilst mono and fluoro crimp, braid does not. For example, braid could be passed though the eye of a swivel 2 or 3 times and then just granny-knotted without reduction in strength of the rig (I'm not advocating granny knots though!). Conversely, passing mono or fluoro through anything more than once immediately creates a weakness, as there's a very high likelihood of crimping. Due to this, the 'capstan effect' of 'more than once through/around' cannot be taken advantage of if you're using mono/fluoro lines. Re. breaking strain ... yes there are cheapo braids that are weaker than stated, but with most high quality braid this is not true (some braids being stronger than stated). Then there's snap/shock resistance ... how do we measure that accurately? Re. abrasion resistance ... many factors go into what they term "abrasion resistance", and how this is tested can greatly effect the comparative findings/results. A huge factor is the diameter/thickness of a line. So yes, as braids are generally thinner than monos/fluros, they will (generally) have lower abrasion resistance. And by the same token, pre-stretched monos/fluoros (what they laughingly call "Double Strength") will have much lower abrasion resistance than lines that aren't pre-stretched. The worst abrasion resistance I've ever come across is in the lines many anglers having been looking for for many years, that is, soft/limp fluorocarbons. In most cases at least, for every extra strength a certain line gives us, there's an added (and obviously unadvertised) weakness, so it's a balance (you don't get owt for nowt). Otherwise we'd all be using the same line.
Anglers are still using Maxima and Perlon, and swear by the lines they've used since the 60's (I think one or two on here may still be using cut-gut
) . And that's fine in my book. We all should use only what we feel comfortable with, and only change if we have (or think we have) got a problem, or think our rig(s) might be improved. But also make sure we keep an open mind.