In my experience in our country none of them are accepting crypto as payment unless they are already into crypto community and know how to use it. One thing for sure is there will be time that banks will make a crypto atm and use it as debit/credit card to use in shop.
Likewise in my country there aren't many merchants which accept BTC as payment. Main reason is people dont know much about crypto and secondly due to government advisories on cryptocurrency.
Same problem in my country also they don't accept Bitcoin. Government has regularized Bitcoin. In future atleast if they accept Bitcoin it will be great.
I did this three years ago and I got rejected so many times trying to pay them with my bitcoin. As if now, most of the countries don't accept cryptocurrency as a payment because as what you've said l, they aren't knowledgeable enough.
But for me, i think the reason is that they think of something hassle converting those currency in to fiat currency. I also think that they want a direct payment in such that you pay them with their country's own currency. For example, in the Philippines they aren't familiar with that so, if you want to pay in transactions, you should pay them Philippine Peso because that's what they used to do.