I don't know that Viv or anyone else is 'upset' - just hopeful that custom play isn't a notably watered down experience compared to origins most likely....and it's a valid concern coming out of the tags implementation in DOS2. What Adam stated is hopeful and promising, but generalized still rather than specific as to the actual depth involved.
I too hope that it's so deep in permutation content that it makes us all chuckle in hindsight, but as of right noe, none of us have a way of knowing the true extent involved.
On top of that, it is also important because D&D is meant to be a system that is all about custom characters and creating your own story to share with the other players. I understand that we can't have as much freedom as tabletop, but the essence of it should remain. In other words, the feeling that you have created something unique that impacts the world differently than other things should still exist.
It is exceedingly rare that D&D offers premade characters. It only really happens in starter sets, like 5e's Lost Mines of Phandelver. That is actually a perfect example because LMoP offers premade characters because it's assumed that it will be run for new players who might feel overwhelmed by character creation, which is a great reason to provide the premade character option. But, players who know how to play or are new but want the full experience can still make their own character and feel good about it, because there's no down side.
