Then again, they amassed those very older ships for the final push to Cardassia. And few if any ships were lost in that part of campaign in the end.
Retiring all the old clunkers at that juncture is certainly possible and even likely, though!
The problem with paying too much mind to the changes to the E model is that in the future more ships will bring undergoing perpetual refits. Will that mean that they’re all therefore clunkers, or that suddenly the Star Trek universe has entered a new era of bad workmanship? Even if you judge the refits as natural upgrades for new technologies that have no bearing on the worthiness of the original ship, it’s the same issue.
I tend to see this as an opportunity rather than a problem. We get precious little material to satisfy our starship fetishes to begin with. If there's variety, good - and if the variety is of odd sort, all the better.
If ships get altered, this can fall in two distinct categories: alterations early on in the life of the design, and alterations later on, either to long-serving ships or then to newbuilds of a legacy design. The former cater for the story that "something went wrong"; the latter cater for the equally interesting stories that "something new was tried and panned out/did not" and "a sudden need arose for changes, either to the class or then to a specific ship". The latter might stem from individual damage sustained (many ships in WWII ended up diverging from their nominal class because they got different repairs at different times, not because there would have been an intent to upgrade as such), or from new shortcomings discovered in face of new threats.
The changes to the E-E might be due to damage, of course. But the subtle changing of hull curvature would suggest truly catastrophic damage, in which half a hull is lost and has to be rebuilt, now to a different shape. Moving of nacelles is trivial in comparison; even bolting on a third one might be!
Of course, there's nothing wrong with catastrophic damage here.
Enterprises might not be flagships, but they sure are disaster magnets all, ending up at hot spots quite regardless of their Starfleet orders.
What about when old ships are “refit” before this brave new era, like the Enterprise in DSC and soon SNW? Or possibly the Miranda we saw in the trailer for season 2 of LD with its glowing red Bussards, if it’s a flashback scene and not a contemporary one.
I'd phaser the LDS bridge when we come to it. But I'm cool with NCC-1701-nil getting lots and lots of refits, of the repair sort, for the combination of her being quite old; coming from an era where ships weren't yet built to last a full century; and being the worst disaster magnet of them all by far, engaging monsters and gods and invaders on assignments initially presumed dull.
Timo Saloniemi