Thank you @stefanv, I like this proposition.
Concerning this famous Hinsen principle, as it was already mentioned, we already broke it at many occasions when fixing bugs (see https://github.com/scikit-image/scikit-image/issues/6510 for example or https://github.com/scikit-image/scikit-image/issues/6456).
A partial solution to this problem is to support pip installing any version of skimage using git branches like proposed here.
We may also publish the timeline with the different scikit-image release dates and use it as reference to specify which version of the package is concerned by the S/O question according to the asking date… This is also applicable to youtube tutorials…