I know the brand/studio reasons, but all I can come up with for in-setting lore reason is that Mirandas require less resources/crew/maintenance, but it still seems like a sharp contrast between the service lives of both ships where, as far as I can tell, the Excelsior-class may have required more resources/crew/maintenance and that judging by size and a history of jankiness alone (I love the ship, I really do, but it’s still an in-setting thing) and even the Constellation seemed to be kept around at least a little longer than the Constitution.
Anyone got any sources about this that make it feel justified besides the studio/suits deciding “we don’t want audiences to confuse anything on screen for the TMP refit” ?
If that was the reason, Deep Space 9’s lost ship count alone would have ended the Miranda-class.