I agree. There are must be some losses in translation, cos pictures are just approximations to the elements of thinking process. Pictures have some "cross-platform" features, but their expression power much lower than language's. Ex. consider that language 1 has expresson power x, pictures have expression power y (x > y). And language 2 has expression power z (x = z). Then we're trying to reduce x to y and then take it to z again.
Instead of this we must take x to w (w > x) and then reduce w to z. A human translator going exactly this way.
How would explain a concept such as searching? Or a hyperlink?
Granted those are some contrived examples, but whatever problems we have with text and losses in translation, we'll also have (perhaps to a lesser extent, perhaps to a greater extent) in picture messaging.
These are just my 2 cents.
5000 years from now, I hope we would have advanced enough to instantly translate (correctly) from one language to another. Or just speak one language.