Even if you are a skeptic about type systems, you probably already use one in your code. However, because you refuse to use a formal type system, you are missing out on better tooling that takes advantage of the type work you do anyway, and that the open source community can do for you.
There is a possible "React Native Web Singularity", when it starts being a better standalone choice for developing for the mobile web than react-dom. If this speculation comes true, this would be gamechanging.
It’s tempting to assume that all packages in the npm registry are safe to use. The vast majority of packages are safe… but, some aren’t. And, some packages that used to be safe can become compromised. Even in a safe neighborhood, it’s best to lock your car.