All those discussions are making it harder than it need to be.

I have ONE static external IPv4 for my network.

I can handle everything I want with it. And block everything I dont want my network to be.

So I just disable IPv6 on router (Mikrotik).

Not interested, not wanting it. That is it. If someone needs it, feel free to use it. I wont support double configurations on my router because of it.