I am not sure what planet you are from but here on planet earth IPv6 is needed for local lan traffic so Windows and any other OS can talk to each other,
Disabling IPv6 on your WLan or Lan will cause problems with most Windows user's (like yourself) trying to figure why networking does not work.
--- most user's will have to reinstall Windows (like yourself) to get networking working.
IPv6 has been around for about 15 or 20 years and weather you like it or not it's here to stay and weather your ISP has got off their fat multi billion money grabbing asses and spend millions of dollars to upgrade their antiquated equipment people like you will wounder why they can't get to a new popular site.
--- most user's will have to reinstall Windows when ISP's do upgrade their equipment (like yourself) to get networking working.
Fun Fact: Who uses IPv6 the most
- Third world countries --- WTF why is that it cant be right --- Ya it is because third world countries are just starting out and IPv6 is enabled by default on newer equipment
- Cell Phones --- WTF why is that it cant be right -- Ya it is because the equipment needed to support the ever increasing data transfer rates has IPv6 is enabled by default
I would suggest that anyone reading this post to check and make sure you have IPv6 enabled.