I should have said... I only ever do the Taikyoku's not the pinans... last time I did the pinans was for my nidan grading
One of my students after class candidly said to me "I get the feeling you never met a kata you didn't like."
It's not completely true, but I do tend to find something in every kata that I like and ura is no exception. I quite enjoy Pinan's in ura and perform them regularly.
I'm not saying ura in kata directly translates to fighting, I just appreciate it as a progression of kata. Like so many other incremental training techniques.
The kata themselves are incremental in complexity. One stance in the first two, two in the third, three in pinan ichi, etc. The footwork and technique in the kata similarly and I believe strategically advances.
Further examples in Ippon kumite, progressing to sanbon, progressing to free sparring.
They're each forms of incremental progression, adding additional variables, building the student up in complexity.
A good grading syllabus does the same.
The drills I use preparing for tournament, are incremental too through the course of the eight to ten weeks prep.
Ura to me is just one of those increments, it's association with kata doesn't make it any more or less relevant than some incremental sparring drills.
All goes to preparing us for the deep end, when everything around us is moving and someone is trying to hit us.