Stickers: when I joined WikiTree, I also learned that stickers are just a decorative feature for profiles. But this must have changed in the past very few months, because since then there are also links for stickers at the bottom of profiles that lead to categories that groups profiles with this sticker. I guess we would need someone very experienced with categories to discuss the technical part of this.
>>I see some people use historical names as subcategories of "today" names.<<
This would be wrong, but there is also still much clean-up to do on the Italian Location Categories.
Correct would be the before/after template. The historical place name links to the today place name and the other way around. This works also for merged municipalities.
Here is an example for Italy, see the "timeframe" and "timeline":
https://www.wikitree.com/wiki/Category:Castelmonardo%2C_Vibo_Valentia
We have WikiBot that renames all the profiles after a category needs to be renamed or merged. Thankfully that's not really a problem :-).
You are right that when the 1980 places names would be the standard, we would not need to keep track of renamed or merged municipalities.
Well, as everyone on WikiTree can create categories and as they were not really important until recently, there are lots of location categories that didn't follow a style guide or were else set up a bit incorrectly or just not the same as other subcategories from the same category. So after having a more detailed style guide, it would be time to clean up.
Example from Italy:
Region: Calabria, Italy = Calabria, Italia
Province: Province of Catanzaro = Provincia di Catanzaro
Special case that we treat like a province: Metropolitan City of Reggio Calabria = Città metropolitana di Reggio Calabria
Municipality inside of Metropolitan City of Reggio Calabria: Ferruzzano, Reggio Calabria
Following this, the Swiss categories would be:
[[Category: Canton of Valais, Switzerland]] = [[Category: Kanton Wallis, Schweiz]]
[[Category: Riederalp, Valais]] = [[Category: Riederalp, Wallis]]
But that's how we chose it for Italy Project and I think this is what Isabelle told us and started to create and we followed this as it made sense to us.
Also about Wikipedia: for Italy I found that the English pages are not always up to date with the Italian pages (as those are separate projects and not just translations). So if you would want to use Wikipedia as source (which I do for Italian Location Categories), then you would need to use the page in the original language of the location. Or maybe the German Wikipedia for all languages, as that one has a very strong community with many Swiss users (I think German Wikipedia is the biggest right after English).
Whatever we choose as style rule for Switzerland, it should be the same for all categories. So as I said, there's probably some clean-up work waiting.