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There are still lots of customers with IPv6, if you go completely and totally v6 only then you limit your potential customer base. Now going v6 internally with a dual stack edge makes sense, Meta has done this.

Because a few large companies are holdouts. Github for example. Some AWS backend stuff. Many smaller ISPs that represent a very long tail.

Most of it is not any particular difficulty for you, but because of someone else.

Many wired networks are IPv4-only, so you've excluded a bunch of consumers. It'd be like not supporting the Edge browser.