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Being able to access legacy systems from new ones is a good property of new systems. This workaround is important.

(Also that may be done on routers which today deal with NAT anyway)

This isn't a workaround; it is a kludge. There are far better solutions in this problem space (some mentioned in this very thread).

Yeah I don't get it. If you need to access IPv4 for legacy reasons then dual stack seems like the solution here. Yes it's a lot of overhead since you have to deal with an IPv4 and IPv6 routing table. AFAIK Windows has had both enabled by default for a long time.

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