I work with fans from all over the UK and I was asked the Darlo question regularly by plastic fans of franchise clubs(not saying ExeterMiller is a plastic fan or doesn't know his stuff) when NYS was being built.
The main differences are they crammed 25,000 seats into a stadium which would hold 18,000 max if it had the same leg room as NYS. Their fan base was historically lower than Rotherham and S****horpe and most the town support bigger clubs in the region. The way forward must be capacity's around 12,000 so you get some full houses and good atmosphere in Lge 1 and 2 but can quickly expand if you reach the Championship or beyond.
I guess in the Championship Glanford Park held Scunny back a little for being too compact. Another 1,000 home seats and away seats plus concourses with bars could over a season given the club more income towards players. Plus more chance for young Scunny kids to get to big games and get the bond with the club. With council support and switched on directors