Peregrine means a wanderer, something with no connections; now, historically this state has been applied only relative to the issue of essential dignity/debility, and is not connected (in its theory) with accidental dignities/debilities, so-looking at peregrine within its defining area of consideration of essential dignities/debilities-the fact that a planet might (will) have connections with other planets (which would be considered among the accidental dignities/debilities) is not why I reject the concept.
Originally, a peregrine planet was defined as a planet without any essential dignities OR DEBILITIES-truly "disconnected" from anything that would uplift it (essential dignity) or that would pull it down (essential detriment) Later (around the time of Bonatti) this definition changed: essential debility was no longer counted as an essential "connection", and so the definition of peregrine changed-expanded-to mean any planet that had no essential dignity: "essential debility does not save from the peregrine state", became the motto. So the concept changed into an essentially debilitated planet (having no essential dignities) also automatically becoming "a wanderer" (peregrine, without essential connections). To me, this substantially altered the original concept and meaning of the term peregrine.
Another reason that I reject the concept is that, even in its original meaning (a planet with no essential dignities OR essential debilities), the occurence of this state must be very rare: essential dignities are given by sign, face (planetary decan), triplicity and term. Well, what about by zodiacal (rather than planetary) decan (whether the elemental decans or the Manilius decans)?And the triplicty of that zodiacal decan? What about the duodenary (duad; 1/12th part of the sign)?
And the triplicity of that zodiacal duodenary? What about the zodiacal monomoiria of the degree the planet is in? And the triplicity of that zodiacal monomoiria? If you are going to include sign subdivisions in your allocation of essential dignities and debilities (and you do when you include face and term), then why not include all the sign divisions (like duodenary and monomoiria)? These subdivisions were widely recognized through medieval times (Bonatti) and even by Lilly (to some extent)-so why limit the field to only 2 subdivisions (face and term)? And why limit triplicity consideration ONLY to the sign as a whole? Each subdivision (zodiacal subdivision) has its triplicity as well-shouldn't these subdivisional triplicities (triplicities of zodiacal decan, zodiacal duodenary and zodiacal monomoira) also come into play in determining essential dignities and debilities?
Finally, while I have often seen (or believed that I have seen) the activity of pitted degrees, elevated degrees and Bright degrees upon planets, I must say that I have never seen anything specific/different about a planet which (according to the "rules") was in a "peregrine" state.
These are my personal thoughts and experiences (my personal OPINIONS) which have led me to reject the peregrine concept as a practical delineative consideration...