Nothing. My laptop has 8GB and while this is somewhat the limit, it’s enough to browse, do office stuff, a bit of development/programming and even a bit of CAD for my 3D printer, video editing, retro-gaming and all sorts of things. I’d prefer to have 16GB because Firefox likes to eat a lot of RAM, but the laptop is too old for me to upgrade anything at this point.
If you’d like to waste your resources, you could run 4 other operating systems simultaneously in VMs. Or try artificial intelligence chatbots and load one of the large language models. They can easily make use of 32GB of memory and more.