- A Browser is more adaptable, in general more up to date with new technologies and probably easier to develop/maintain by focusing on smaller steadier releases.
If you accept this then you should also accept:
- With frequent releases, you don't want regular users to be constantly be hassled with updating their browser / add ons and flashing a new version number in their face, especially when there isn't much difference between versions.
And in general, the version number of a browser is just confusing and irrelevant to regular users.