Everything weird about the series finale

First: I love the show, watched everything and I know - the whole story is a mess ;) but a lot of things are even more messed up about this series second finale:

1. Why does Regina assume every Realm wants to be transported to Storybrooke? I'm pretty sure the people of OZ want to be nowhere near to their Wicked Witch ;)

2. I always thought the different Realms (Enchanted Forest, OZ, Arendelle ec.) were on the same planet - different from earth - but all together... how would they all fit in Storybrooke?
Are there a lot of holes know, where they came from?

3. Are there now 3 Henrys, 2 Reginas, 2 Wicked Witches, 2 of everybody who got back in time? Plus their Wish-Realm Versions in some cases?

4. So we have Young Henry, Back-in-Time-Old Henry, and Wish-Henry... and Original-Timeline Regina and Back-in-Time Regina... Even if Young Henry went off to his adventure and Original Regina follows him years later, they will know what happens and won't get cursed a second time... So if we see it from a point of what happened, happened and not from a back to the future perspective, where people disappear when the past gets changed--- there are a lot of doppelgangers in Storybrooke ;) and they just didn't mention it!

5. Will Young-Henry even become the same Old-Henry now that he knows what happens?

6. Regina did kill the Grandparents of Wish-Henry - even though she didn't know they were real and not just illusions...
So it didn't make much sense for Wish-Henry who never knew her, to forgive her. Wish-Hook and his daughter are examples of Wish-Folk who are accepted as real...

7. What was Rumple's problem? If it was so easy for him do die, by just giving up his heart - he could have gotten back to Belle any minute?

Roundup:
- A lot of people have doppelgangers now
- Regina never got punished for all the people she killed (Sheriff Graham, an entire village, Wish-Charmings, her Father) and for cursing everybody in the first place!
Instead everybody loves her now - kind of a dark ending if you see it from this perspective.
- A lot of Realms got kidnapped ;)