Phil,
I'd say, absolutely not, unless the land calls for it.
Striving for equality amongst the nines would seem to stifle the creative process and compromise what the land best presents.
Don't you think it creates a "forced" situation.
One play at Somerset Hills might dispel your premise.
I like imbalance in the nines, I think it introduces diversity and a refreshing, if not unusual presentation.
Before I played Pacific Dunes I was a little taken back by the "perceived" imbalance in the nines, but, once there, and able to see and play the golf course, what I had thought might be a big negative, wasn't.
GCGC and NGLA don't have balanced nines.
Both start off in a generally benign fashion, but quickly turn after the 2nd and/or 7th hole.
The other factor that strikes me as creating imbalance is one I love. The WIND. On many courses the prevailing winds create a clear imbalance, a different playing experience.
Vive la differencia !