Here's my opinion on a PG (worth exactly what you pay for it):
Double the weight means the stress lasts twice as long at the same torque. Some things can endure .1 seconds and survive, but can't take .2 seconds worth. Has to do with any part that flexs or twists.
Diesels have a narrower powerband relative to their total operating RPM, but also have higher average HP in that powerband. Neither is ideal for a transmission to deal with. The narrow powerband makes it harder to find the right convertor, and really needs more gear ratios than a gas engine does. The higher average power in the powerband goes back to the duration of high loading.
Should you bust the tires loose in first gear, or have trouble in the burnout box, that torque load when it shortshifts or grabs will be far higher than anything normally seen a racecar. Perhaps several times higher. It's why I'd be very reluctant to run a locking convertor with a PG in a 6000+ lb truck. A lot of impact potential there.
I know Dodge guys experimented with PG's in light diesels and went in other directions. Could it be made it work? My guess is yes. Is it the optimum setup for a turbodiesel? My guess would be no. Weight and low cost are the reasons I'd look at one.
I only drove one car with a PG. It was a 2600lb car with about 600ftlbs running low 9's. The PG it had in it failed while I was driving. How many passes were on it? I can't say, but it had about 30 passes? that weekend before it failed. Don't know the reason either, so that info is pretty useless, other than they can break at relatively low power and lightweight.