Frietas was young, but Ramos (24) and Leon (23) give us options at catcher going forward. Suzuki gives a probable starter atleast this year and next. You stockpile in the farm system so excess prospects can be used in trades.
Considering they've given up two good young catchers in the past year from the minor league system (remember the Gio trade too? (Granted the Gio trade was an excellent move; Suzuki was not)), the farm system is getting weaker because of that.
I wouldn't be proud to call Kurt Suzuki a starter. He's mediocre at best.