They're lousy in very specific use cases, but there's clearly some reason why every website in the 90s had a footer menu and now they all have hamburgers instea

They're lousy in very specific use cases, but there's clearly some reason why every website in the 90s had a footer menu and now they all have hamburgers instead. Is it all just 100% because they're cleaner looking? Or is there some actual usefulness reason for the switch? I don't know enough about the space to have an opinion on it, but there's obviously something at work here.