Jynocidus
Sadly, you're the proof..
1. Galactus
2. Arishem
there's a logical reason why these beings are categorized in a certain way.
Galactus represents balance. All of the beings on the opposing team are "balanced," and none of them can tip balance in their favor without a quantified plot device giving them the capability to do so.
Arishem represents most likely a higher side of one side of said balance, which is why Celestials and certain abstract beings seem equal.
The truth? Celestial / Hellish beings have an effect on the lives / existence of all lower beings the same way as abstracts do, which is why "gods" are portrayed weaker than these angelic or infernal superiors.
Gods like Thor, Zeus, Odin, etc...they're still susceptible to Good and Evil, which are both sides of that Balance that Galactus represents. I could go more into detail but I'll wait to see what others have to say about it.