If you're in the US, the problem you would have operating on the assumption that "crypto is a currency" is that it's very far from established that this is true, legally speaking.
Crypto-assets are variously regulated more as property, commodities or securities; and from an accounting perspective I don't think that's a distinction that can be willed away.
For example, there are just certainly tax implications that won't be accurately recorded if you assume that income of 1 BTC offsets expenses of 1 BTC. My understanding is that the IRS wants you to calculate the USD fair market value of each of those transfers at the time they occur in order to determine the tax implications.