Most of us who have been around awhile have knotted our spools every 5ft (safety) or 10ft (other spools).
Uses:
Measuring wreck parts (beam, length, height)
Guesstimating depth on a free ascent with a broken gauge
Knowing if you have botched a blind jump (gone too far so it must be somewhere else)
With knots every 5 feet you can recognize your safety spool line if you totally botch your lost line drill in a cave (looping back ontop yourself. Only safety spools are knotted every 5ft)
Overall, lots more veratile. Just one knot every segment, don't go crazy making 1,2,3 knot codes and BS like that.
I'm all for that. My reel is knotted... but I haven't gotten around to knotting my SMB spool yet, although it's been on my list of TTDs for a while.
I fail to see how having a "properly knotted" (clearly an optional thing, of course) applied to the original comment, however, at least, not in any meaningful manner.