From what I know is that pilots where always moaning when they had to make an approach as number two behind a TP aircraft, because of the TP that really is going slow on the approach while the jet guys have to reduce to minimum speed and even will catch up the TP's.
Sounds like rubbish to me. You can hold a much higher speed down final in a turbo prop than a jet because you can slow down very quickly.
never met any person who would love to go back from jet to TP... only vice versa.
many of the 73 pilots I fly with would much rather be back on their old TP but don't like the idea of the pay cut. I'd be back in a flash if the money was the same.
I have seen quite a few (10-15) pilots unable to transition from TP to 737 but have no experience with people trying to go the other way.
Following the VNAV blindly is pretty dangerous, running a three times profile to cross check the VNAV is essential if you want to remain safe for more than a few years.