Exploring Black Canyon of the Gunnison

Black Canyon of the Gunnison is one of the USA's deepest canyons. It's located in western Colorado, quite in the middle of nowhere. If you were to google the top deepest canyons in the USA then for some reason Black Canyon of Gunnison isn't listed in these countdowns. I just checked the first two results, it's weird, it clearly should be included. Maybe it's just so under the radar place and not known that much.

Top 6 deepest canyons in the USA
Hells Canyon, Oregon/Idaho (8042ft)
Sequoia and Kings Canyon, CA (8000ft)
Grand Canyon, Arizona (6093ft)
Waimea Canyon, Hawaii (3000ft)
Black Canyon of Gunnison (2722ft) was not included in the list...
Zion Canyon, Utah (2640ft)
I read from several places that the Black Canyon of Gunnison is the second deepest canyon in the USA, I agree...

Hells Canyon and Sequoia are officially named canyons but these places really look like huge mountain ranges with a river in the middle. When I think of the word Canyon, I mean huge vertical walls and a massive abyss in the ground, Hells Canyon and Sequoia look nothing like that. This is why I think many don't consider these as real canyons. Waimea is USA but not the mainland so it is often excluded from the list. So you see where I'm getting at. Black Canyon of Gunnison is not officially the second deepest but at the same time, it quite is lol😀