The reason packages are so big is the complexity for an interesting app is irreducible. People don't import thousands of modules for fun; they do it because simple software tends towards requiring complex underpinning. Consider the amount of operating system that underlies a simple "Hello, world!" GUI app. And since the browser-provided abstractions are trash for writing a web app, people swap them out with frameworks.
I'm working on a React app right now where I've imported about a dozen dependencies explicitly (half of which are TypeScript @type files, so closer to a half-dozen). The total size of my `node_modules` directory is closer to a couple hundred packages. It's 35MB of files. And no, I couldn't really leave any of them out to do the thing I want to do, unfortunately.