I don't blame Bloom at ALL for not re-signing JDM. Downward trend from 2018. Not counting 2020 (just disregard it), here's how it went, from a power perspective.
2018 (age 30): 649 PA, 43 HR = 1 HR every 15.1 PA, 1.031 ops
2019 (age 31): 657 PA, 36 HR = 1 HR every 18.3 PA, 0.939 ops
2021 (age 33): 634 PA, 28 HR = 1 HR every 22.6 PA, 0.867 ops
2022 (age 34): 596 PA, 16 HR = 1 HR every 37.3 PA, 0.790 ops
I mean, the trend was clear. Not a small sample size either. He was going downward, though it must be said that even in 2022 he was an above average hitter, with a 117 ops+. So it's not like the guy was COOKED. He just wasn't JD F-ING MARTINEZ anymore. Not by a long shot.
If you were a betting man following the 2022 season, smart money would have been on his numbers further declining. Not a guarantee, of course, but definitely that would be where the smart money would be. Even if he stayed the same, we're talking about a 35 year old guy who hits a homer every 37 PA and plays no defense whatsoever. The only real place you can put him is at DH.
Now, Justin Turner. Not surprisingly, given his age, his trend is similar.
2018 (age 33): 426 PA, 14 HR = 1 HR every 30.4 PA, 0.924 ops
2019 (age 34): 549 PA, 27 HR = 1 HR every 20.3 PA, 0.881 ops
2021 (age 36): 612 PA, 27 HR = 1 HR every 22.7 PA, 0.832 ops
2022 (age 37): 532 PA, 13 HR = 1 HR every 40.9 PA, 0.788 ops
So yeah a similar downward trend. Of course JDM has always been a better hitter than Turner, but Turner at least offers you modest defense at two positions, while Martinez gives you nothing on defense.
I have no issue with them letting JDM go. I loved the guy, and he was an enormous part of this team for a few years, and was key to winning a WS title. No disrespect to him, no animosity towards him, nothing like that. But I'd have bet that he wouldn't be producing ANYWHERE NEAR what he's produced so far this year. Maybe I'd have lost that bet, but it would have been a more than reasonable bet to make if you're Bloom.
Can't fault him for this one, IMO.