Upstream has fixed lots of bugs, critical crashes, and CVEs, and Debian stable takes weeks or months to backport them, and even then only the CVEs. Not even fixing major usability bugs.
I’ve seen users on versions so old where nothing is able it interoperate with them anymore, and the users unable to compile from source themselves.
Currently, the solution I’ve seen from several such upstream sources was to offer a ppa or custom apt repository, and to let users install that.
The usability of debian – especially stable and oldstable – is severely hurt by maintainers not backporting these things, and it adds a lot of work for upstream.
Especially for fast moving things – like compilers, programming languages, networking software – this is a severe issue, and Debian is just ignoring it away, and patching the warnings upstream might have added away as well.
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If Debian wishes to remove the warnings from Upstream, they should actually backport all bugfixes themselves – as they claim they do.
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Btw, I won’t be able to answer to comments on this for another hour, as I’ve exhausted my hourly limit on HN comments – as always.