Hockenheim, Monza, Montreal, Silverstone. Traditional tracks, pleasing a lot no elevation alternate, fan favorites.
India, COTA, Sepang, China, Bahrain, all Tilke tracks, all obtain immense elevation adjustments.
I too once understanding it be elevation adjustments that made tracks particular or that classic tracks had hundreds them, or that it became what made them popular.
However it surely is rarely always. There is too many exceptions for that to be a rule.