I think it's easier to square the circle about this by focusing on 'internal voice' - For those with an internal voice, where do the words come from? We don't pick them from a conscious word bank (mostly), they arise from the subconscious brain thinking about the topic at hand. So to sever the 'internal voice' step of thinking and go from the sub/semi-conscious to the page is if anything just more efficient. It's interesting to think about what we actually gain from conscious articulation of words and images - the benefits of visualization seem more clear cut(though more limited than non-aphantasia-havers might assume) than internal vocalization.