RHEL 6 and 7 EOL questions

According to this page

https://access.redhat.com/support/policy/updates/errata

RHEL 6 is going EOL 11/30/2020 and RHEL 7 going EOL 6/30/2024. But on further down it says that EUS - Extended Update Support ends for:

6.6 (ends October 31, 2016)
6.7 (ends July 31, 2017)

And RHEL 7

7.1 (ends March 31, 2017)
7.2 (ends November 30, 2017)

So what does all this actually mean? Does this mean that if we are using 6.6 we are not going to be able to get support after 10/2016 and no support for 6.7 after 7/2017 even though the product is not going EOL until 2020? Can someone explain this to me in laymens terms please? Because the way I see it, why do I need a subscription that includes EUS if RHEL 6 is not going EOL until 2020?