joto left a comment (openstreetmap/openstreetmap-website#5973)
> It seems there were good reasons to introduce it for the XML format back in
> the days.
I don't think too much thought went into that decision at that time. It
probably simply seemed a reasonable way to do things and it totally does make
sense if you are thinking in terms of a "diff" file and not in terms of
versioning. I am not sure about the timeline there, it might well be that we
did not ship history files back then, so the idea of having a "visible" flag
instead had not come up. I never thought about the file format until I had to
implement it and found it more complex than it would need to be due to that
extra level of hierarchy in the XML. And interestingly enough, we still only
have change files in XML and not in PBF, because in PBF there would be no other
way to format them than with that "visible" flag. (Side note: The [underlying
software](https://github.com/openstreetmap/osmdbt) has supported creating PBF
diffs for years now, they are just not used.)
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