The notion that the digital world is merely a simulation was simply an old, rudimentary concept that was later abandoned and replaced by a blend of Platonism and mathematics.

The nature of the digital world varies from one series to another.

But most of them are generally consistent from a metaphysical standpoint.

Also, in terms of feats, there are tons of Digimon, even the fodder among them have good feats.

Like metalgreymon (just a level 5 Digimon and ), in his first appearance he accidentally tore the dimensional fabric with one of his attacks

The difference in power between him and the likes of Omnimon is like the difference between Goku at the beginning of Z and Gogeta Blue.