There is even a Daedalus-class ship called USS Horizon in Sisko’s office, which might be named after the cargo ship Horizon in ENT.
I’m aware that ENT wasn’t referenced in TNG/DS9/VOY for obvious reason. But there doesn’t seem to be any interest in that particular crew or the NX program, although 22nd century history will be referred to when necessary and the NX registry has been used all to way to the 24th century.
Plus, there was the whole USS Dauntless NX-01A. Although it was created by an alien species, the Voyager crew never questioned the registry, believing it to be a Starfleet vessel. So, did Starfleet just start over with the NX registry once the Federation was founded?
Just seems like that part of history is willfully skipped over.