I feel similarly. Oneshots are designed to tell a (mostly) complete story with intentional endings (perhaps open-ended if they're fishing for a serialization) and consequently authors tend not to introduce adulterating factors like side characters or plot threads. There's probably a lot of literature about the pros/cons of short-form storytelling that could explain it in better detail, but I'm no fuzzy
Reading older one shots/anthologies/limited series is a great way to freshen up a stale read list
One shots are also a great way to play around with more abstract or experimental art, like the author does here with the MC's POV panels.
