you like slaac, huh?
go ahead. let your devices create their own addresses (slaac with scope:global addresses).
using ipv6 without packetfilter/firewall, in a world full of internet-of-shit devices and "it doesn't need to be secure,because its just the local network"-services, is a very bad idea.
ddos is already a big problem in the current internet.
gl hf with your ipv6 bot-army.