Why does external modules not depend on a specific kernel version ?

Hi,
I'm quite new to Archlinux and there are a few things I don't understand about the way pacman handles kernel and modules packages.
I understand that modules in the repository are only build against the current kernel version and that you should update both at the same time to keep your system in a working state, however I don't understand why the package system does not enforce that.
For example if I look at the current nvidia modules (100.14.19-3), it will install its stuff in lib/modules/2.6.23-ARCH and hence (should) depends on kernel26>=2.6.23.
However if I take a look at the package itself, it only depends on kernel26.
If I upgrade the modules without upgrading the kernel or upgrade the kernel without upgrading the modules, I will break my system.
In my opinion (but I may be missing something) the package manager should be robust and should make sure your system stay in a coherent state.
Is there a technical reason for this or is this only to avoid having to modify the packages dependencies each time a new kernel is release ?

Very interesting, I was right when I said I was probably missing something
As I said in my first post, I'm a new archlinux user. I'm more familiar with debian/ubuntu systems.
The way they are solving this kind of issue is simply by putting the kernel version number in the package name.
For example you have nvidia-kernel-2.6.23-1 which depends on linux-image-2.6.23-1.
This solves these kind of upgrade issues (I did a search in the forums before creating this thread and I saw there were a hell lot of kernel/modules dependency issues that have already been reported by other users).
The advantage of this system is that you can keep both the old and the new kernel package on your system at the same time are revert to the previous version if something goes wrong.
However the drawback is that you have to maintain several versions of the same package in the repository at the same time, which may be contrary to the archlinux philosophy...

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