You are right that some drivers have not been updated for a long time. Some of the older drivers have no planned updates. Most of the verison updates are for adding new devices to the driver along with their new features. Some updates are too add support for new operating systems.
You can see what is added in each release at What is new in the latest Intel® Ethernet Software release?
You can see individual driver versions listed at Intel® Network Adapter historical driver and software version numbers
Are you looking for information about a particular adapter and OS?
The OS; addapter; particular moterboard can be found that's the way I (we) always do ... I hope
It seems that would not be so difficult to add the referred links to the respective download page(s)
Thanks for the suggestion. I will add those links.