I think Marc street names argument is very valid.
There was a discussion recently on the French forum about old communal boundaries, some are even wanting to put 1970 boundaries in OSM. Worth the discussion at least, even if I don't think it is a good idea.
Yves

Le 4 novembre 2017 13:51:00 GMT+01:00, Simon Poole <simon@poole.ch> a écrit :


Am 04.11.2017 um 13:36 schrieb Andreas Bürki:


 Agree. I would never delete old boundaries, as they might server later
 on for historical purposes, e.g. If somebody wants to do a map showing
 the development of community mergers in Switzerland.



As I've pointed out that has nothing to do with the changes at hand, but
regardless of that: removing the old boundaries after mergers is simply
a practical concern.

- they don't actually exist
- they make editing (a lot) more difficult
- there are no QA tools for them, essentially guaranteeing that they
will be broken and useless after a couple of years
- in summary: an awlful lot of baggage to carry around for the
theoretical use case of documenting ~6 years of changes in the
boundaries (which you can get from the history dump without all of the
above issues)

But as said, that is not the issue at hand.

Simon