Wow, I remember having Mosaic running circa 1993-4 under X windows. I’m pretty sure it was invented for the same reason everything else was - to make finding porn easier and faster.
My first browser was mosaic on a 386. My first picture download took hours. I finally got rid of the 36 this month. My wife was using it as a stand-alone non-web connected genealogy machine running DOS and an old but efficient genealogy program. It is still on a separate machine but it is all updated and unconnected to the web. Information is transferred by thumb drive after being checked for viruses and anything else unwanted.