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IPv6 is compatible with IPv4 there are millions of devices with only an IPv6 address that work just fine.

No, I only have a v4 address with my ISP and cannot use a v6-only device at home.

IPv6 is backwards compatible to IPv4 but not the other way around. If you have a solution how to address a 128bit IPv6 address with the 32bits available on v4 I'm sure many people are eager to talk to you. It's just not possible.

With a 6-to-4 gateway then yeah. But at that point you're using v4.

How do you expect compatibility with v4 protocols/software/hardware/routers/ISPs to work without using v4?

That's a serious question. Do you have a way for this to work? Because I don't think it's possible (for fundamental reasons: https://en.wikipedia.org/wiki/Pigeonhole_principle), and it would be extremely unfair to criticize the designers of v6 for not fixing an unfixable problem.

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