The safeword issue is interesting, partly because it so often gets completely misunderstood by people on both sides of the debate. To stay with, “no safewords” usually gets conflated with “no limits no safewords”, when in reality real “no safeword” play typically has more limits.
I’d also suggest that in kink play there really is no such thing as “no safeword play”. Sure you can negotiate to not have one, but do you really think your top won’t stop if you say “I’m going to puke, I feel faint”?
There’s a separate corporal punishment and disciplinarian scene where safewords are quite uncommon. I suspect this is because they restrict themselves to quite narrow activities that don’t really carry long term risks (I.e. caning or paddling)
Forfeit play where there’s a word that stops the immediate torment in exchange for 6 hard cane strokes sounds quite fun actually.