Why is that?
The D is already pretty large, anything bigger risks being a fanboy ubership.
That is something I've never understood.
What is "fanboyish" about a big starship? Or why do some critics label really large starships as "portable starbases" when they are not remotely as large as a starbase.
Why are the huge Romulan ships. From the Warbirds to the Scimitar not called "fanboyish" or "mobile starbases"?
What about the huge Dominion battleships or the huge Klingon Neghvar class vessels?
The Scimitar has always been criticized as being fanboyish.
But really, it all stems from the fact that fanboys have a fetish for insanely large and way too powerful starships so that anything particularly is by extension fanboyish. Maybe it's not fair, but that seems to be the way of things.
And yes, I am well aware that Trek starships are generally smaller than ships from other sc-fi franchises.