…“educated” suspicion (sic)…
I try not to start laughing right from the start, because I am afraid I will not make it to the end - alive ! 
The TIB Ampersand bowline, for example, which requires the same amount of material, and the same number of tucks, with any Janus bowline, is, according to Dan Lehman s educated guess, “material-inefficient” and “complicated”.
The same happens with the TIB Pet loop, which requires the same amount of material and the same number of tucks with the Span loop.
The same happens with the TIB Pretzel loop, which requires less material, and fewer tucks, than his mediocre “quick8” - which does nt seem very TIB to me…
I could easily go on and on, and compare the “material efficiency” and the tying complexity of those knots with Dan Lehman s “Mirrored bowline”, or his two TIB Zeppelin-like loops - the one he did publish, and the other he promised to publish, as soon as my growing beard reaches the floor…
In sort, TIB bowlines are sour grapes for some knot tyers who had not educated themselves on this subject - and, to blur the issue, they keep singing the same old song again and again, about “multiple knots, each suited for a specific goal”… Yeah, by definition there is an infinite number of specific things, in general, and “specific goals”, in particular, and so there is an infinite number of knots suitable for them - so, when one wants to tie something, he should only ask the self-acclaimed “educated” gurus…
There ARE TIB bowlines which are as good as, or even better than, any other end-of-line loop - and I would even argue that we already have too many of them ! In my previous posts, I had referred to some - the interested reader can search for them in this Forum and elsewhere, tie and try them - he will only need a piece of chord, and common sense ! Practical knotting is not rocket science, it is a subject no more difficult than arithmetic, for KnotGod s sake - it requires only patience, and, from one level and above, passion. However, I have to point out that a minimum portion of due reference to, and sincere evaluation of, what we already know, and of honesty as well, will make no harm…