The pipeline for RP prospects needs a long time to develop
You basically need to hoard arms for over half a decade and then you finally get a trickle of the failed SPs who can be good RPs filtering up
I don't think it's really this regime's fault, yet.
If you look at the good, young, whiffy relievers in other bullpens many of them will be 2014 to 2017 signings or draft picks.
They have gone budget on pen acquisitions and because of that decided to NOT target whiffs, but that has kind of worked out. Like Cimber is good. Phelps is doing alright.
They could be better at trading for or claiming relievers with potential and making them into something. Jason Adam and Bryan Baker were even here, for example...