They are not expected to deal with this. This is the responsibility of the Debian package maintainer.
If you (as an upstream) licensed your software in a manner that allows Debian to do what it does, and they do this to serve their users who actually want that, you are wrong to then complain about it.
If you don't want this, don't license your software like that, and Debian and their users will use some other software instead.
I think you need to chill out. Relicensing the way you suggest would be _quite_ the hostile act, and I'm not going to that either. But I am an engineer, so of course I'm going to talk about engineering best practices when it comes up.
You don't have to take it as an attack on your favorite distro - that really does pee in the pool of the upstream/downstream relationship between distros and their upstream.
The trouble is you seem to be assuming that best practices for you, in your opinion, also apply to everyone else. They don't. Not everyone sees things the way you do or is facing the same issues or is making the same set of tradeoffs. There are downsides to what debian does but there are also upsides.
At this point, given the plethora of high quality options available as well as how easy it is to mix and match them on the same system thanks to container-related utilities and common practices I really don't think there's any room for someone who doesn't like the debian model (ie in general, as opposed to targeted objections) to complain about how they do things. If you want cutting edge userspace on debian stable at this point you have at least 3 options between nix, guix, and gentoo. There's also flatpak and snap which come built in.
I wager it's only a matter of time before we see a mass rooting event that hits Debian hard while everyone running something more modern has already been patched.
I think that might be what cuts down on the grandstanding about "freedoms" and "that's how we've always done things". You certainly are, up until it becomes a public nuisance.
Why would you expect LLMs not to be simultaneously leveraged to catch backports that were missed or inadvertently broken?
Given recent headlines I think it's far more likely that we see a mass rooting event hit one or more of the bleeding edge rolling release distros or language ecosystems due to supply chain compromise. Running slightly out of date software has never been more attractive.
OpenBSD in particular can use competent developers to fix their dogshit filesystem.
I assure you, enormous sums of people prefer Debian the way it is. I do not, ever, want "new stuff" in stable. I have better things to do than fight daily change in a distro, it's beyond a waste of time and just silly.
If you want new things, leave stable alone, and just run Debian testing! It updates all the time, and is still more stable than most other distros.
Debian is the way it is on purpose, it is not a mistake, not left over reasoning, and nothing you said seems relevant in this regard.
For example, there is no better way than backporting, when it comes to maintaining compatibility. And that's what many people want.