Like if you spot a good deal on a Tele with a rosewood board but you prefer maple, you can be safe in the knowledge that you can replace the neck fairly hassle-free somewhere down the line.
Or if you decide you don't like radius or the neck shape/size.
Or if you decide you want 22 frets instead of 21.
Hell, sometimes it's cheaper to just get a whole new neck than get a decent fret job.
I'm not saying those are huge selling points for me. Just outlining what I believe his original point was.