By using knots you already know and and are peer-reviewed and field-tested, you are embracing simplicity and reliability.
Sure, but
that does not mean :
1. That all knots that are worth to be known, are already known.
2. That you know all known knots.
3. That only the known knots, or the knots that you know, that are peer-reviewed and field-tested, are the only knots that can possibly embrace simplicity and reliability.
I know
many knots that you do not, and vice versa. And I believe that there are still some knots waiting to be discovered, just under our noses - as was the Gleipnir, for example. The "new knots" I know are not peer-reviewed and field-tested, possibly just because most people believe that all that could be known, is already known...and not because they are complex and unreliable !
Leaving this issue aside, I think that the "midline bowline" bend, i.e. the knot nub of a simple "mirror bowline", is a knot simple enough, but not tested in this form. I do not know if it is reliable if
any end(s) is/are pulled from
any direction(s), as required. The Zeppelin loop tied onto a bight formed by a Butterfly loop, is a reliable solution, of course, but too "complex" and not so clever and economical in material use, as it could be, I think. ( I put the word "complex" between quotation marks, because the simple arrangement, the one after the other, of two simple knots, do not make a complex knot...) I feel that, in this solution, much of the rope material used is redundant, and could be eliminated.