You can get 48 min onto a 10.5” reel using 1mil tape versus 33 minutes for 1.5mil tape. I just use 12” reels if I want to get an entire album using 1.5mil tape onto one reel. This saves storage space and it is more satisfying to hear the whole performance without interruption.
Maybe my brain is confitioned to where a record flips. I dont want to listen to AJA or Rumors both sides without a break. I would rather heavy tape and get up for a break, manage things and get back to listening. Just me.