Your commet often throws me somewhat off-balance....nice way, I don't feel too bad.

Incidently, I have that book and it's pretty often my bed time reading (after I read Garfield to my daughter). There is lot of information there and I have used lot of it.
Anyway, HSS has it's merits (used it first 15 years......) and I'm also discovering more or less proper use of carbide inserts (pretty much works contrary to HSS most of the time). I like tungsten inserts in the winter - I dont't like grinding in my garage and its frigging cold outside!
I never got good results with carbide tipped tools......but they are sold like hot cakes, someone must like them someting else than turning sand encrusted lumps of cast iron.
Anyway, THESE cartridges have good pocket for a carbide insert, they must have good geometry, made of right materials and if can device proper way of using them they even might turn usefull and I just might learn something.
PekkaNF