I've been watching some DS9 again, and it's occurred to me how many Excelsiors Starfleet seems to operate.
I know they've viewed as old ships, and I don't want to get into a registry number analysis thing here, but rather than viewing them as obsolete, old designs, maybe Excelsiors (far more than Mirandas, which do seem to explode a lot) were so ahead of their time in the late 23rd century that, if properly modernized, they remain fully modern and competent frontline ships right up through the Dominion War?
It seems to me that Starfleet is missing a technological "generation" that would be in the first third of the 24th century or so. Given that the Romulans were in isolation, the Klingons peaceful and rebuilding and the Cardassian Wars still to come, perhaps when the first batch of Excelsiors were aging, Starfleet looked at them, decided they were still more than capable of service, and modernized the existing hulls while building a new batch. They could have done that three or four more times throughout the 24th century.
A relatively small number of Ambassador-class ships might be been fielded to make sure that Starfleet still had a premier class of ship that could go up against the very best any competitor power could field, but it's entirely possible that it isn't until the 2350s or so that advances in technology require Starfleet to begin rolling out ships in the Galaxy-class design family, with Excelsiors still being entirely respectable ships.
I know they've viewed as old ships, and I don't want to get into a registry number analysis thing here, but rather than viewing them as obsolete, old designs, maybe Excelsiors (far more than Mirandas, which do seem to explode a lot) were so ahead of their time in the late 23rd century that, if properly modernized, they remain fully modern and competent frontline ships right up through the Dominion War?
It seems to me that Starfleet is missing a technological "generation" that would be in the first third of the 24th century or so. Given that the Romulans were in isolation, the Klingons peaceful and rebuilding and the Cardassian Wars still to come, perhaps when the first batch of Excelsiors were aging, Starfleet looked at them, decided they were still more than capable of service, and modernized the existing hulls while building a new batch. They could have done that three or four more times throughout the 24th century.
A relatively small number of Ambassador-class ships might be been fielded to make sure that Starfleet still had a premier class of ship that could go up against the very best any competitor power could field, but it's entirely possible that it isn't until the 2350s or so that advances in technology require Starfleet to begin rolling out ships in the Galaxy-class design family, with Excelsiors still being entirely respectable ships.