The thing conventional commits are really helpful for is continuous delivery. Every merge to main can be automatically tagged with semver and shipped because the thought that goes into tagging and versioning has already been done by the developers when they wrote the commit message.

I fully recognise that it doesn't make sense for huge projects like the Linux kernel to do this. But for 99% of projects conventional commits combined with semver vastly improves the release process status quo and makes it easy to automate.