Ideally they'll reach a point where they've finalised the dialogue completely, and make an internal declaration that it will not change any more - after which they can smooth it into a single coherent character.
Making changes with a dedication to full VA is a *lot* of work they're making for themselves; I don't mind if it's scruffy and not polished from the outset, so long as it IS polished up once the dialogue is set in stone.
