So I don't have a lot of experience with anime, but do 50% of them end with the abstract themes of the show suddenly getting personified as weird abominations that destroy Tokyo?
Akira, Serial Experiments Lain (well, not quite, but sort of), Paranoia Agent
All the best ones end with abstract themes of the show turning into giant robots to punch the living day lights out of something.
Eureka Seven AO 2
Not knowing how this connects to Eureka Seven is frustrating. Especially since every aspect that does connect more or less contradicts the ending to E7.