Maybe you're not getting where he is coming from. Scaling the ship up without adjusting the specific details is what makes it seem wrong & silly and implausible, and what makes it, in something like your parlance, a MIS.
Make It Stupid.
Hey, it's been 40 pages of thread, and they obviously don't get where he (or previously, me) is coming from. For whatever reason, the thought of massive starships just does it for some people. It doesn't make a lick of sense, but, well... BIG STARSHIPS, YEE-HAH!
I've asked you twice now and you haven't responded. if there is no sense to larger starships, why does Starfleet have three versions of the same shape (Nova-small, Intrepid-medium and Sovereign-large) in service in the 24th century? What can the Enterprise-E do that Voyager couldn't?
It's not "yee-hah" it's "why not?"