“What changed things...repeating famously Castro phrases to South Florida Cubans?”
I have no idea. But I watched an interview of him sometime in late February I believe, where he admitted that he’d written most of his speeches up to that point, but was looking into getting speechwriters (no reason given). He was a valedictorian English major in college, so I imagine he thought he could get away with something like that. But at this level, speech writing has to do with an awful lot more then being able to string sentences together in a tidy way. And gaffes like that highlight this. It really should be handled, at least partly, by professionals.
Definitely. Dealing effectively with words takes experience, time and great care. Even a candidate with great writing skills of their own doesn’t have enough hours in the day to do even a fraction of it.