Good point. But I think fee becomes an issue when used under the "Crypto as a currency for paying for goods and services" use case. Most people are using it as "Crypto as a speculative investment" and all we do is buy and keep it in exchanges and move around exchanges. In most cases all cryptos except bitcoin (currently) the fee is very low and we are willing to pay for it atleast I am. In my humble opinion, without mainstream adoption the value add generated from low fee is not significant.