ORIGINAL: bem
But I'm sure Futaba has cut some corners on FHSS/S-FHSS compared to FASST otherwise they would not have choosen to have the former (starting in 2010) in their radios targeted more towards the beginner segment. FASST was already there since 2005 and is obviously more expensive system otherwise Futaba would have choosen that also in the budget line radios that got FHSS/S-FHSS instead.
I think using the term "cut some corners" is a derogatory one. Certainly, Futaba has controlled costs, mostly be reducing the feature set (programming, memory, etc.) as well as the over all cost of building the transmitter (less expensive gimbals, etc.).