This statement represents a paradox to me.
If you don’t understand what you’re doing on a fundamental level, you can’t possibly have a reason. And if you don’t have a reason, why choose an alternate tuning?
Serious question… Is standard tuning holding you back?
It isn’t holding Steve Vai or Joe Satriani back. It didn’t hold Stevie Ray Vaughan or Eddie Van Halen back. It might, however, potentially hold Derek Trucks back.
And Fripp’s aspirations as a player are, well… Esoteric by design.
See, alternate tunings are arrived at when proficient players run up against very specific limitations: i.e. notes that are out of reach for a particular arrangement, or the logistics of playing with a slide, for instance.
Beyond that, tuning schemes are completely arbitrary. Piano, guitar, violin, saxophone… Each with the notes arranged differently, yet countless great players have demonstrated virtuosity on each of those instruments, to equally lofty degrees.
Someone upthread suggested subscribing to a single tuning scheme and learning it inside out… I concur. No better advice could be offered. The bottom line is, if you’re a beginner, or don’t otherwise have total command over your instrument, you’ve got work to do.
To that end, in my opinion, it’s probably best to stick with standard tuning, if only because there is a wealth of learning material out there already, and a longstanding precedent of what can be achieved, nowhere near exhausted.
Cheers!