Haven't spent some hours thinking about the advantage that is associated with Bitcoin in company ecosystems, new start-ups that are located in crypto-friendly countries are now diving into Bitcoin as payment against the regular faint traditional currencies, after administering questionnaires to some of the business CEOs stated the reason to be the anonymous nature and its intrinsic value. That is to say, Bitcoin is a business within a business because of its decentralized nature and volatile market.
So the company gain in two ways for accepting bitcoin for payments and if the price of bitcoin goes upward interest are generated also.
You have a point but you are not taking in consideration of the fact when the price goes down the businesses will be at a loss because you are looking at it from your own point of view, so lets say that you are a owner of a shop you buy stuff from a company that manufactures goods and sells them to business at a price using fiat, so you buy from them something for 10 dollars and you sell it for 12 using bitcoin, the next week the price dips and you are left with 9 you will be at a loss, i think crypto and bitcoin are a great payment option but not for business to depend on.