Well, it's not at all about exclusion. I listen to (and really like) many black metal bands with rather short tracks such as: I Shalt Become, Krohm, Nocternity, Imperium Dekadenz, Taake, Farsot, Nachtmystium, Abigor, Leviathan, Lurker of Chalice etc.
But I prefer those epic pieces of art made by bands such as: Lunar Aurora, Nagelfar, Heimdall's Wacht, Paysage D'Hiver, Darkspace, Katharsis, Agalloch, WitTR, Krallice, Altar of Plagues, Lantlos, Negura Bunget, Deathspell Omega, Forgotten Woods, Drudkh, Blut Aus Nord, Forest of Stars, Peste Noire etc.