There has been significant turnover on the pitching staff and farm staff, but not enough at the top of the rotation.
Here is an incomplete list of pitchers lost and gained since the end of 2023:
Lost: IP/ERA
Paxton 96/4.50
Sale 103/4.30
Kluber 55/7.04
Bleier 31/5.28
Llovera 30/5.46
K. Ort 23/6.26
Brasier 21/7.29
Garza 18/7.36
Robertson 12/6.00
Joel Rod. 11/6.55
Bearclaw 8/12.91
Sheriff 7/2.70
Dermody 4/6.75
T Scott 4/4.91
Littell 3/9.00
Faria 2/22.50
Lamet 2/13.50
S Drohan
V Santos
Brock Bell, Jose Ramirez, Railin Perez, Ryan Miller, R Ammons
To DFA or stay in AAA? Jacques 27/5.06
Added:
Giolito
I Campbell
J Slaten
C Criswell
R Fitts
G Weissert
J Benitez
H Olivarez
N Judice
C Zink
(Added to 40: Wikelman & Perales: doubtful either will see MLB in '24.)