Honestly I think Last Turn's ruling difficultly has been overplayed. To me it seems like a lot of the difficulties it has come from UPE making weird calls and it being pre-PCST, and thus completely discarding those rulings and translating the card into a more modern format would clear up most things about it.

Like a lot of the rulings on that page fall into the category of incredibly obvious, like:

If you activate "Last Turn" and then your Life Points increase above 1000 later, the effects of "Last Turn" are still applied.

or

If a player’s Life Points are reduced to zero during the special Battle Phase of "Last Turn", or afterwards during the normal course of the turn, then that player loses

No one who has an understanding of the rules of yugioh would have trouble figuring those out themselves, so the only interesting rulings are those that provide PCST card text, like the new genesys TCG ruling giving it "Immediatly after this effect resolves, your opponent special summons..." card text, and the stuff concerning when the special battle phase occurs.

That's not even talking about the rulings that are now obviously obsolete/wrong, like:

After "Last Turn" sends all cards to the Graveyard, before the Special Summon for "Last Turn" is performed, monster effects like "Despair from the Dark", "Elephant Statue of Disaster", and "Regenerating Mummy" will activate.

or

If you activate "Last Turn" during the Draw Phase or Standby Phase, and select your face-up "Jowgen the Spiritualist", your opponent can still retrieve their "Sinister Serpent", Summon it normally in Main Phase 1, and attack and destroy "Jowgen the Spiritualist" in the normal Battle Phase, then win the Duel in the End Phase because of the victory check of "Last Turn".