I don't really agree with that. The advantages of depositing and withdrawing in cryptocurrency are undeniable. However, regardless of what I deposit in cryptocurrency, I still find it much more convenient to have my balance and bets displayed in a currency I know or the currency I deposited in, rather than some unknown fiat currency. For example, US dollars and euros are by far the most used currencies in the world so the casino should set one of those two as its default when registering an account. Also, the casino should allow changing the base currency in user settings in case someone makes a mistake during registration.
I am with you on this one and i also know many embers here will share similar likes like yours here, i will be more comfortable seeing my balance being displayed in $ euro for easily understanding the balance. But I will be glad to deposit with cryptocurrency but being able to convert my deposits in my account won't be a bad idea.