I didn't recommend dropping IPv4. It's a terrible it to start a new project in 2024 without IPv6 support though. It's easy enough to build in from the beginning that there's not any real reason not to go for it.
And running a dual stack is trivially easy for almost everyone using it. That chart has almost half of Google's users coming in via IPv6. I promise you less than 1% of that 50% have ever even heard of IPv6, let alone done a single thing to configure it. With my ISP I'd have to go out of my way to turn it off, which I haven't done because this isn't 2008 where it broke things more often than never.
And running a dual stack is trivially easy for almost everyone using it. That chart has almost half of Google's users coming in via IPv6. I promise you less than 1% of that 50% have ever even heard of IPv6, let alone done a single thing to configure it. With my ISP I'd have to go out of my way to turn it off, which I haven't done because this isn't 2008 where it broke things more often than never.