Given that through the entire franchise the Only Rule with respect to Starship shots on screen is:I don’t think it’s a matter of them not paying attention. I think it’s a matter of them not really knowing what to do about SNW’s visual inconsistency, and choosing (correctly in my opinion) to go with the TOS visuals for their show.
"What looks good to the audience..."
The various production design teams aren't ignoring anything. There have been plenty of shots in DS9 where the Defiant is too large in relation to the DS9 space station itself.
Basically they've always been composing shots with the audience in mind and nobody's paying attention to the actual fan debated length of the ships.