I specified recreation instead of technical because:
Techie divers can have such quantities of cylinders they couldn't have ditchable lead even if they wanted any.
Recreational divers don't usually have to worry too much if they don't stop on the way up, so it avoids a blanket "Missing stops could kill you so weight shouldn't be ditchable" argument, and keeps it a bit more open to debate. Hopefully, anyway [
]