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.