The Future of Knowledge Graphs

This might sound like an incredibly naive question but why haven't we been using knowledge graphs all the time? I think it's two things right. Like especially as climate science evolves as well, you want to understand how the patterns are changing over a period of time. And also how from a ride share or other perspective like if there is, if it is going to rain, is that going to cause a rise in demand for caps? Right? The ease of access trumps precision in some sense, right? The margin of error that is caused by using a grid system like H3. This sounds like a great idea instead of joining data in all these archaic ways,. spread across thousands of tables