> Those characters are literal Creator Gods that are for the intents and purposes o the story all-powerful. While the likes of Argosax and Mundus, while indeed far more powerful than the majority of characters, aren't. They are still challenged, they are still rivalled, beaten and surpassed.
This claim is also entirely false, and I am honestly surprised that you're saying this, especially with DMC5 being released.
Argosax and Mundus are only rivalled by Dante himself. Mundus himself needed a ton of prep-time and a specific transformation to be challenged by Dante, while Argosax's entire defeat was surrounded by a lot of PIS on the part of the developers due to Dante's lack of preparation to fight him. The entire lore paints those characters as literal Gods in the verse, absurdly above anyone else, to such a point that those who attempt to take even an infinitesimal fraction of their power are driven insane with how much it is, as is the case of Arkham and Allan Lowell attempting to obtain some of Sparda's power for themselves, and how
DMC5 has only further established how insane being anywhere near the level of a Demon King is, with Mundus needing to eat a fruit from a sacred tree, a fruit that never appeared again in the verse for thousands of years, in order to rise to his position and dethrone the King before him, and with him being the god responsible for crafting the events of the whole series.
And Argosax as soon as he was established was already stated to have literally come out of nowhere and risen to his position, forcibly dethroning Berial and demolishing everything on his path, subduing every demon on the Underworld and being worshipped by other Demons and humans due to his power and dignity.
They fit the label of a God-tier much better than some of the literal Gods of other mythological verses. They are definitely all-powerful beings that can't be challenged.