Why not get a phone that can take, send, and receive pictures and video. It would also have maps, GPS, encrypted messaging, streaming music, audiobooks, e-books, home automation apps, ride hailing, food ordering, decent browser, etc.
Then, stay with me here, don't install social media apps. The lengths people go to so they can avoid social media when it is extremely avoidable is crazy to me.
Your ISP is doing it wrong, which I guess you already know. I get a /64 net via DHCPv6 for my LAN which is pretty standard.
+1 to dual stack. Too much of the internet is v4 only, missing AAAA, or various other issues. I've also had weird issues where a Google/Nest speaker device would fail 50% of the time and other streaming devices act slow/funky. Now I know that means the V6 net is busted and usually I have to manually release/renew. Happens once every few months, but not in a predictable interval.
Security is different, but not worse IMO. It's just a firewall and router instead of a NAT being added in. A misconfigured firewall or enabling UPnP is still a bad idea with potentially worse consequences.
Privacy OTOH is worse. It used to be that each device included a hardware MAC as part of a statelessly generated address. They fixed that on most devices. Still, each device in your house may end up with a long lived (at least as long as your WAN lease time) unique IP that is exposed to whatever sites you visit. So instead of a unique IP per household with IPv4 and NAT, it's per network device. Tracking sites can differentiate multiple devices in the house across sites.
This has me thinking I need to investigate more on how often my device IPv6 (or WAN lease subnet) addresses change.
"Notably, Google, Bing, and DuckDuckGo all have the same problems, and in many cases, Google performed better than Bing and DuckDuckGo by the researchers' measures."
Click bait headline. I see they're good at SEO themselves.