Sure, If I work something online with someone, I offer them crypto first as a payment. If he refuses to take the crypto then I pay in local currency. Most of the time I use Ripple as payment because we have Ripple support here at the bank. If the block fee is low, I sometimes use Bitcoin to make payments. In addition, I use Bitcoin to make purchases from online (for example: gift cards, virtual cards).
Its the most convenient imho when it comes to payment but not totally get rid of fiat payments which is also convenient and if you do really mind about investment then you would really have doubts on spending your
crypto which you would really be ending up on using your fiat in the end.
I have been able to use my coins wayback when steam was still accepting bitcoin on purchasing steam wallet funds which its really convenient but once i do tend to accumulate coins
as much as i can then i do stop that habit.
I do spent up fiat if i would able to do so but if there are some convenient ways then i do go with that.