At some point you take a developmental risk and you expect one out of a handful to work eventually work out. I think we're seeing that with Tyler Shough in New orleans.
I think it helps when you take low cost risks. The saints used a 2nd round pick on Shough. Definitely a real cost but assuming it's their own, not exactly betting the farm.
Part of the Brown's problem may be what they lost to get Watson. I don't know what you'd expect out of 3 first round picks, a third, and a fourth, but I would assume competent organizations are going to get two regular starters out of that? Maybe three? But definitely not helping your qb to have 3 first round picks and a 3rd and 4th over a three year period just turn into smoke. Then you throw a project QB or a game manager QB in and ask them to deal with a surrounding cast that has a talent deficit.