To let outsiders decide what a country should be called, despite the country itself objecting, is beyond weird to me. How would you like it when your colleagues decided to call you by another name, just because they liked it better?
To my knowledge absolutely no one calls them the "Confoederatio Helvetica" in normal conversation, neither the Swiss themselves nor foreigners. (And ironically that name seems to have its roots in an occupation by the French revolutionary army and a name given by Napoleon Bonaparte)
Also, I don't think you can always assume inhabitants of a country can agree to a common name. Often, names are heavily associated with political issues or power or identity issues and it may be impossible to choose a particular name and staying neutral in the conflict.
Example: Try to ask some people from Northern Ireland whether the name of the city is "Derry" or "Londonderry".
This already happens. It’s called nicknames. Sometimes a name in its original tongue is hard to pronounce for others, so we adopt a simpler one for convenience.
Though I would agree a bully might continue to use a nickname which has been _vetoed_ by it's target.
Exonyms are very much a question for the outsiders. Nothing even remotely weird about it.
> How would you like it when your colleagues decided to call you by another name, just because they liked it better?
But they very often do, so what can you do about that? For example I seriously doubt that any large group outside of China calls Chinese nationals with proper tones, so that's over one billion people being "called by another name" in one fell swoop.
Why should a country have only one name across the whole world regardless of language being spoken? What are countries without Latin languages to do: write “Turkiye” amidst their non-latin script?
And what of the Kurds? Is their spelling now wrong?
Turkiye is how it is spelt in Turkish. Every other language has its own spelling and pronunciation. This happens with all countries.