The ability to have a monetary policy is a bonus and it's the reason centralized money is price stable. If you were paid your salary in bitcoin on May 1st this year you would've lost 50% of that at the end of the month, good luck paying your rent
In addition to the original crime and legibility discussion as a practical means of transaction crypto is volatile, expensive and slow.
That statement makes no sense. Crypto transfer fees are not a percentage of the transferred amount.
And around $2400 for etherium. Which means that in the common use as a payment it will be more expensive. On top of that you get into questionable situations if the shop owner wants to charge differently because of the fee as that is already disallowed for plastic cards.
Have you looked at fees on crypto "currencies" lately?
The best price my friends could get sending fiat from country a to country b recently was 10 euros (with Wise) other options were 30+ euros. Keep in mind, this was for a few thousand. The fee would go up the higher the amount was.