Was Goguryeo overrated?

Looking at the indicated area,
many people feel regretful, thinking that if Goguryeo had unified the peninsula,
that vast territory would have been ours...
But looking at the remaining historical records,
there wasn't a huge difference in the populations of the Three Kingdoms.
While Goguryeo was the strongest,
its period of overwhelming dominance was short, and it ultimately failed to unify the peninsula.
National power is determined by
population and economic strength rather than territory.
Just as Bucheon and Anyang in Gyeonggi-do
are more influential areas than Hongcheon or Yanggu in Gangwon-do.
Because of the maps used for the Three Kingdoms period,
I often get the impression that Goguryeo has been exaggerated.