Also, the design for Canyons is intentional. You CAN fly above some of peaks with the proper skills. It provides interesting and unexpected tactics. I've seen people use them many times.
OMG once me and my clan mates found this super hidden hiding spot that the squid can hide in. (Possibly Mobula, junker, Pyra, goldie also)
I just dont see any use of it other than a grand escape. Just had to mention.
And ye, when i first played dual at dawn, i also got stuck there. But i quickly learned. You can actually fly thru there with some skill and kyrosine (moonshine) on a squid, goldie. I managed to fly thru there with a Spire with minor flaws, any other times i tried where it fatal flaws.