This is my understanding.
The guys at Unigroup have logged in cylinder pressures on some bigger budget builds including Nitro Harleys. Yavuz was more than happy to take some of us 'tragics' through some of the data after one of his tuning workshops had concluded. Nitro in cylinder pressures are a frightening thing when you think about having a piston pointing at your nuts.
If you have a reasonably knock resistant fuel I can't understand why you would decompress and engine and then go and re-compress it with air from a turbocharger.
(keyboard warrior only here and I bet with big power builds that knock sensitivity, as static compression goes up, needs to be considered particularly as a large framed turbo starts pushing serious air).