Could someone sell me on why I should switch to this from regular Vim?
There's a few really cool things. The built in LSP is pretty clean compared to clunky nodejs or python plugins which I've found to clog down on huge codebases. The syntax engine has been improved by a tree-sitter algo, so it's way more robust with the syntax hilighting. And while I haven't messed with this yet you can do the whole config file in Lua now, which sounds pretty powerful.
The improved tree-sitter code parsing also allows for stuff like this which you won't find fully implementable in mainline Vim yet: