One of my longest owned saws is a rip at 10 ppi. It is very slow on the cut and doesn't get used much.
My most used rip saw, a Disston #8 is at 6 ppi. For a short while my coarsest saw was 4-1/2 ppi made from an Atkins #8. When ripping ash it wasn't much faster than the rip saw at 6 ppi. One day while ripping some ash the plate buckled and snapped. It may have had an unseen crack or the saw plate was too light for this use. One of these days it may get toothed to a finer pitch and used as a panel saw.
jtk
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)