Just a few months ago, I had experience with Ethereum, and here I met the concept of gas for the first time. Bitcoin made everything simple - you just had to set the amount of the commission and wait for the transfer to complete. It takes a long time to get a small commission, whereas it takes a short time to get a large commission. Everything is not so simple with Ether. Having an ambiguous opinion about gas, I would like to know if there are any positive aspects to it?