So, this is the reason why you don't take all Scripture seriously. You think it's just the writings of other people such as yourself.
You really do need to understand something important about Scripture. It's not Peter's understanding nor knowledge nor opinion, that he writes for us on paper:
Knowing this first, that no prophecy of the scripture is of any private interpretation.
For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
It's God telling him what to write, whether he understands what he is writing or not.
All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
The prophets and apostles are not providing 'commentary' on them going before, and Peter himself says they don't understand all they are writing about, when writing it:
Of which salvation the prophets have enquired and searched diligently, who prophesied of the grace that should come unto you:
Searching what, or what manner of time the Spirit of Christ which was in them did signify, when it testified beforehand the sufferings of Christ, and the glory that should follow.
If you started believing all Scripture as inspired from God with exact truth, then you would read it and teach it differently, and He would provide you revelation of the Spirit about what is written.
Such as answering the question why the Lord will want to spend a thousand years ruling natural people on earth, which will be but as a day to Him and His resurrected saints:
It will be the greatest harvest of souls ever on earth, with Himself personally preaching His gospel, His resurrected saints personally giving the perfect sense of all Scripture, and Satan shut up from accusing, resisting, and tempting on earth.
It will be the time, when it is perfectly proven, that them who don't love Him, just plain don't want to, so they can be as gods with their own will and rule to live by.
They will be the ones outwardly bodeinet, and then swiftly rounded up against the Lord by Satan after the thousand years are expired.
As I said, if you would rely only on Scripture to tell you what Scripture has to say, you'd teach Scripture only, and not your own conjecture as though it were Scriptural truth.
Case closed.
Peter did well in writing exactly what God told Him to.
God always does well in knowing exactly what He is talking about.
P.s. this has absolutely nothing to do with the fact that 2 Peter 3 is speaking of the end of all the elements of heaven and earth, and not just a local geographic event, nor an event that gradually spreads over all the earth, and into the stars as well.
God's word in 2 peter 3 cannot come to pass, until after His fire devours His enemies around His beloved city on earth.
Because Rev 20 speaks only of that fire devouring His enemies around the camp of His saints on earth.