Late to the thread it seems.
The forum rules as I recall have a section on doing your best to spell correctly, which Splashy does. Even among those with perfect vision, there are those that find spelling easy and those that struggle.
I had a courier that delivered my parcel to the wrong street and couldn't erase the signature when the error was pointed out to them! There does seem to be a long list of things the technology doesn't allow them to do.