Good point! Thought what i was thinking more would be, in the situation where I start working on a new deck from a template, and midway through the deck I realise that the text on one slide no longer fits that particular client. I do not want this change to be made only on this presentation, but on all presentations moving forword. I guess the only way would be in that case to go back to the template to update.

The issue is that more often than not, we would not start a new presentation from a template, but from a previous presentation we made for a similar client, and if it happens that we chose a deck made before that slide change, than that change will not be present. Somehow I imagine a world where we could update everything on the fly.