Well, since the Ross class does indeed look like it could be a refit of the Galaxy class, then it basically supports my hypothesis that SF simply turned the Galaxy class into the Ross class (much like they converted the Titan from Luna to Neo Constitution).
The Titan was not converted from Luna to Neo Constitution. Riker's Titan was (presumably) wrecked somehow after his time as Captain, but major systems were salvageable so they were removed and put into the Neo Constitution Class ship that would be the Titan-A (maybe it was just decomissioned and scraped, but the image makes it look damaged to me). One of the people who worked on the show even had done concept art showing this, and its as close to a canon explanation as you're going to get to explain the connection between the Titans. Even though the artist still calls it a "refit", thats obviously not what is happening.
https://twitter.com/DaveBlass/status/1633800104321712131
https://www.reddit.com/r/StarshipPo...itan_refit_to_titana_star_trek_picard_season/

A long while ago, after having seen my fanart that I posted, Dave Blass, production designer for Star Trek: Picard season 3, approached me to do some work for Star Trek: Picard, which led me to collaborating with him and John Eaves on the USS Titan to Titan-A refit concept!
I did the 3D modelling of the Titan-A using references, while the Luna-Class Titan and the Drydock are from Star Trek Online. I composited and lit the shot with guidance and feedback from Dave, before it was sent to John for a paintover.
Since David Blass had the image made, I'd say this is what they had in mind.