[Spoilers] About beating the game
::: spoiler spoiler
So, if I decide to go and beat Ganon early to unlock the completion tracker, the game resets back before the fight after credits roll. So does that mean I can do the the rest of the main story also (phenomena and so on), or do I get locked out? :::
You’re not locked out of anything
Nothing becomes unobtaineable or unsolvable by completing the game once. Even the boss itself can be refought an infinite amount of times, so don't worry about it ;)
The same as last game. Nothing happens.