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> new software and hardware is being developed or rolled out right now that is incapable of working on an IPv6 network

I would be shocked if this were true for hardware. Even for software, every major OS in the last 10 years as supported IPv6, and prefers it over IPv4

I’m sure there’s horror stories, but I doubt it’s systemic.

> prefers it over IPv4

That's the problem. If the OS starts using IPv6 preferentially but the software on top can't handle it, then you get a crash.

E.g.: if you turn on IPv6 for DNS and it starts returning AAAA records instead of A records, then a lot of applications fall flat on their face.

Usually the type written in C and insisting on maintaining compatibility with whatever Berkley did in the 1970s.

Some enterprise software I guess? I have native IPv6 since 2010 and can't remember a single software that crashed because of it.