Does the information contained in smell and touch contribute to the acquisition of language? Keep in mind you'd be arguing that people born without a sense of smell take longer to develop language, or are otherwise deficient in it in some way. I'm doubtful. It's certainly tricky to measure full sight / sound vs. text, but luckily we don't have to, because we also have video online, which, surprise surprise, utterly dwarfs 30,000 hours of sight and sound in terms of total information.
One qualitative difference is that the child's 30,000 hours is realtime, interactive, and often bespoke to the individual and context. All the videos on youtube are static and impersonal.
