My assumption has always been that the Galaxy class was the last of the family. Those smaller classes refined the technology and allowed bigger versions of the machinery. I say this because I had the impression that the ships of Wolf 359 were not as new as the Enterprise, which was only three years old and was the second ship of her class.
Pretty much this. The Galaxy class was basically the pinnacle of that design family, which included the Challenger, Cheyenne, Freedom, New Orleans, Olympic, Springfield, and Nebula classes, the last of which I believe came before the Galaxy based on registry numbers (to me, the Niagara has more Ambassador-era attributes even though it has GCS nacelles, and the four FC ships are really oddities that don't quite fit into the lineage 100%.) But after the Galaxy class, Starfleet's design lineage changed to the Sovereign style of starships.
I also think that the Galaxy "design family" was a pretty recent addition to the TNG time period, maybe only 10 years before TNG.
Based on registry numbers, I think the old TMP movie designs lasted a very long time before Starfleet decided to build newer ships.Which would explain why there were a million Excelsiors and Mirandas flying around in the 2360's-'70's while there were hardly any of the Galaxy family.
Well, the chain of onscreen and backstage connections would have us believe that the New Orleans class Renegade was an active player back in 2347, with a 57000 range registy; the other "older" family members, with like registries, could be dated to that era, too. The Galaxy sisters are some "15000 units newer", and it would be fun to think this means 15 years newer by and large...
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