The government's decision of St. Kitts and Nevis to make BCH the legal tender for payments in the country would be bullish news for the future of Bitcoin. In my opinion, the more countries that legalize the use of Cryptocurrency as a transaction tool, the brighter the future of BTC will be.
On the contrary, governments legalizing shitcoins like BitcoinCash could impede adoption as citizens would associate failure if the currency to pick up to Bitcoin, which is the leading cryptocurrency. Altcoins and CBDCs alike are just distractions, which I don't believe has any significant, long lasting effect on the trajectory of Bitcoin, in terms of adoption and popularity.
If you consider the country which has adopted Bitcoin directly, it really has not had much of an effect on the market, and that's a good thing in my opinion; government's policies does not influence the market, it's actions of traders that do.
Not entirely annoying in my opinion, I mean so that everyone knows in advance how to use crypto as a means of direct payment such as buying food and clothes.
This will return to the experience process where everyone will seek the best in their life experience, it could be that if BCH fails to meet the needs of the citizens of Saint Kitts and Nevis it will be very easy for the government to transfer it to BTC because people in general can already use crypto in payments.
I think we also have to appreciate this because there are still very few countries that legalize cryptocurrencies as a means of transaction in their countries. Even though it's true that you don't think it will have a big impact on bitcoin at the moment, if the use of BCH isn't going well in that country, maybe you can find an alternative that is easier, safer, more comfortable in transactions.
Ultimately Bitcoin will be the solution