i am a noob and i had to breadknife a razor right when i first started honing. but i believe i had no choice. i will agree with you though i have read a bunch of post where iwas surprised to see the option of breadknifing put out there, and i'm a noob.

i bought a Stainless puma that was new but had been sitting for around 25 years and though it didn't look too bad it had some wicked rust and discolouring in the middle of the edge that went into the blade about 1..5mm and when i touched that spot it disintegrated. so i was left with a big space with no edge. i breadknifed it down to where i though it was all gone but i was wrong so i may have to do it again, that rust was wicked stuff. this for me was a good experience because i learned very quickly that breadknifing should be my last option. it takes forever to set another bevel. i did breadknife an ebay razor i bought for like $4 but it was more for me to experiment with so i knew what i was getting into at that point.

as i said i learned it should be the last option though for me it was my only one, but i could be wrong right.