I don't think it is all that trivial. Different thought based tasks are optimized for different sorts of thinking. Thinking in pictures is the best way to navigate through space, it can be done with words as well but it is horribly inefficient. Drawing something you have seen before is much easier to do if you think of it as a picture rather than try to encode it as a series of words that describe it. Somebody who only thinks in words ends up using words as placeholders instead of images. If you see a painting you may encode it as 'A painting of a turtle, it is done with oil paint, the turtle is surrounded by a bunch of grass, it has a green shell with little flecks of color on it, I can see the sky in the background etc' but wouldn't it be more efficient to just visually recall the painting? In this case you are using words as a placeholder for the image. I once heard somebody say that every picture is worth 1,000 words but not every 1,000 words has a corresponding picture. I think this is very true. In some cases being able to think of something as a picture can be vastly more efficient than thinking of it as words, but some things just cannot really be thought of as pictures, but all pictures can be thought of as words. This is not entirely true either. Language based thinking and visuospatial thinking originate from different neural networks within the brain. When somebody is thinking in sign language or written text though the line kind of blurs, if they have lesions that completely remove their working visual memory then it seems that they can no longer think in language despite having functional language processing neurons. I read once about a person who had brain lesions and he could remember how to write text and he could see text, but he was incapable of reading the text he saw, even if he had already written it. This was caused by an accident that severed the language processing part of his brain from the visuospatial processing part of his brain, both worked independently but they could not communicate with each other.