Software is versioned in numerical order which is pretty intuitive. At a glance it's clear which versions are minor updates, and which are major.

Cars are versioned by year/model, which again makes it pretty clear to understand minor/major updates. Sometimes significant updates are introduced in a model year, but generally the core features remain the same and it could still be considered an upgrade to that model.

Without a clear and intuitive versioning scheme it can be confusing and time consuming to make sense of a product line. And that gets frustrating if it keeps changing.