Omnipotence is the ultimate zenith of all powers.
By the most basic definition, Omnipotence cannot be overcome. Because if it can, then its no longer Omnipotence.
Omnipotence is only applied as a limitation to certain Omni/Almighty/Infinite/Transcendent Powers, its not added to ever power or every page (mainly because there is a rule that states as such that we don't add it to every pages limitations)
Omnipotence is on here because its represents the supreme end point that all powers strive towards.
Its here because a user of it has every power that can or can't exist, its here because there has to be a supreme being in most verses that can never be surpassed or transcended.
Its here because without it, most of the higher level powers on this wikia wouldn't have any applications or associations.
There is no actual response you can give that would give the staff a reason to delete/remove it.