At our fishing club last year we had a session on knots and leaders. One question was, "How strong do your knots have to be, and what is the weekest part of your system?". Using a less expensive 6wt Loomis rod, we bent it almost double (without breaking), yet the pull on the tippet was less than 2lb (we had a fish weigh scale tied to the tipped and anchored to a table). Neither the rod nor the tippet are going to break unless suddenly pressured with a violent (for them) load. Steady pressure is just absorbed by the rod under normal conditions.