Because at least for my own usage of Google the LLM started out as an interactive search with substantially better context filtering that could tune the results to my desired technical level. However I promptly started just having it explain the subject matter to me rather than spending 30+ minutes consulting various docs and forum posts because it makes for an excellent secretary/tutor combo provided you vigilantly watch for misinformation.

So to answer your question, while charts might not be particularly useful for a search engine a tutor certainly benefits from them.