"The cupboard was bare," is the response I'd expect to hear, and although there's some merit to it, I don't agree that it fully exonerates the FO.
They're also responsible for "developing," or "fixing," some of the arms they've brought in. They've gone out and signed Lance Lynn, Martin Perez, Michael Pineda, Rich Hill, J.A. Happ, and Matt Shoemaker in FA. The trades for SP have been better, but that isn't exactly a high bar to clear. Odorizzi was actually worse in '18 with the Twins, he was lights out to start '19, and then reverted back to what we'd seen. We know the 2020 story. As well as Kenta pitched in 11 games last year he's been almost as bad this year. It's hard to look at any SP they've brought in and say that player has markedly improved.
The bullpen has been a throw it at the wall and see what sticks approach from the get go. We're in year 5 and it isn't like internal options, inherited, or acquired via trade, are banging down the door. There's some success (Clippard, Rodney) but a lot more uninspiring additions.