The reclamation project was one of Moyes' specialties, with Arteta and Pienaar being the golden examples.
Unfortunately, he never quite hit on that second wave of players to replace them. Gibson and Drenthe both had the talent to be big players for us but injuries and off-the-pitch issues killed Gibson's career (even though he got paid for a long time) and Drenthe still believed his own hype a little too much (it's actually kind of sad that he considers that the best period of his career).
I don't miss the struggle of the Moyes era but I do miss the feeling of watching players become the best version of themselves at Everton. It's nice to be able to buy the finished article every once in awhile but player development is the backbone of any good club (outside of the biggest, richest ones).