Not true. If anything, AA should have traded more because this team sucked at developing their good minor leaguers and wound up getting nothing for prospects that were once highly sought-after in the trade market like Alford, Pompey, Gose, Drabek, Sanchez, etc, etc.
None of the highly-ranked guys they traded away even wound up being super regretful decisions outside of Syndergaard. AA actually had a really solid trading record outside of the Marlins and Dickey trades.