https://en.wikipedia.org/wiki/Diffusion_of_innovations
libyear is an opinionated metric that prioritises less well tested software. Meanwhile, companies pay a lot of money for RHEL and other products that promise a stable environment that freezes specific (major) releases of software for years - and also promises backports of any necessary security fixes, without those pesky new features and breaking changes that come with using bleeding-edge releases.
Different people, projects, organisations, all have different risk appetites. We need all of them working together; late adopters wouldn't have the stability they crave if early adopters didn't exist to test the crazy broken fresh software.
While everyone needs to manage dependencies, there's no one right way to do it, so everyone does it their own way. They only thing we can probably agree on is doing _no_ maintenance on dependencies is a bad thing.