It might be just my impression, but fuzz testing is underrated and not usually considered as something mandatory for a given system. It's setup cost is not high, and gives enough benefits. As long as you have it in place, you can focus on more functional testing, rather than negative scenarios, which are already covered through fuzzing. And tooling is getting better, moving up the application layer. API spec standards like OpenAPI (and adoption of it) enable fuzzing on APIs which was significantly hard to setup prior to this.