Most people prefer using bitcoin as a medium of exchange.
Did you use Bitcoin to pay household bills, taxes, and regular shopping? I doubt it, you'll still use fiat.
Bitcoin is not really good option to pay regular shopping due to high volatility. You'll need to pay higher fees for get confirmed faster, or you'll need to wait until the price is same as your purchase.
I agree. The only way for Bitcoin to be viable is through the use of lightning network which as of now is still not fully developed and will probably take more years to be useable for common people. Another option is the use of centralized 3rd-party wallet that accepts Bitcoin to pay for bills, shopping, etc (I personally use this because of how convenient it is with Bitcoin).
Overall Bitcoin still has room to grow and too undeveloped to be compared to a fiat.
Talks about Lightning have been going on for several years, but so far nothing has been implemented in the main network... Nobody knows how long this development will last! That's why at the moment bitcoin is a bad tool for daily payments!
It seems to me that bitcoin can become a means of payment, if everything in this world will be evaluated in bitcoins, and while it has a crazy volatility, it is just unreal!