I am gobsmacked by the amount of punishment and expense some dealing out to themselves!

In the name of what?
The boot stripe is not practical, got no aesthetical value (to me), it is not particularly dressing or nice, and at least on Rhapsody caused endless pain and suffering.

First pissing me off with the growth, than double pissing me off with the never ending scrubbing, time which l should have spent sailing as l eventually was, after the surgery. That red pain(t) was especially prone to the dark growth in my area giving the whole waterline a yucky, obnoxious, unclean look.
When the boat was slipped the first time, the painted boot strap was taken off and the hull properly finished, undercoated and antifouled up to the top of the original boot strap + 20mm.
After that l never had trouble with growth. Not that kind anyway. No more messing about with my mind either, pissing me off, forever.
The other boat, the family Benny has a dark blue hull totally devoid of any boot strap, thank havens, and so, always clean and nice.
It was really no fun to work on the yacht on utterly mertricious jobs, which got nothing to do with sailing in the closest sense, or to keep the yacht in good seaworthy condition.