The average J traveler must either not know or not care about the T-96 hour rule as I was able to grab us 19A and 19K for Sunday's LAX-SIN flight.
Not all people like 19A and 19K. I don't personally and have many times opted for normal seats even though they're available at T-96.
Because they're next to the galley, the curtain can sometimes flimsily close thus allow a sliver of light to peek through, yet when closed gives the area a slightly claustrophobic feel. And next to the bassinet seats of 19D and 19F - just having one crying baby there tends to make it a less relaxing flight.