Why is there not a way to upgrade from core to ultimate internally?

I do not understand why if i am running zorin os 15.3 core if i want to upgrade to 16 I now have to do a fresh install?
Why is it not possible to pay within the system and upgrade that way?
I mean when 16 comes out you should be able to the the same in this day and age, I shouldn't have to reset everything up every time a major upgrade happens

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