This is mostly because they decided not to spend high picks on pitchers. As an example, 32 SP provided 2.5+ fWAR last year. One of them was Hendricks, another was a Theo draftee(Godley) that he traded away. Of the other 30, 17 were drafted in the Top 45 picks, and most of those 17 were in the Top 10. Since the draft spending rules were tweaked a few years back I'd expect that correlation to increase in future years. Under this regime, they've made all of 3 picks in the Top 45 that were pitchers, Pierce Johnson(0 for 1), plus Lange and Little who both were only drafted in 2017. Call it 30% poor development, 70% intentionally choosing not to draft pitchers instead of Almora, Bryant, Schwarber, Happ. More concerning would be their inability to turn out decent relievers, necessitating the Duensing, Brach, Wilson, Davis, Cishek, Kintzler, and Morrow moves, to speak nothing of the NRIs/Minor League FAs to get substantial run(Rosario, Coke, Richard, etc). As an aside, the other interesting thing is how few of those starters were international signees. Only Severino, Marquez, and Carrasco. If you drop the threshold to 2 fWAR that only adds 3 more(Reynaldo Lopez, Jhoulys Chacin, Luis Castillo) out of 44 total.