<p><img src="https://images.cointelegraph.com/images/840_aHR0cHM6Ly9zMy5jb2ludGVsZWdyYXBoLmNvbS91cGxvYWRzLzIwMjMtMDIvMGI1MDdhMTktMTBjMy00YzJhLWJkYTAtNjhlYTY3ZDVkZGVkLmpwZw==.jpg"></p><p>"Good user experience is not about the average case, it is about the worst case," wrote the Ethereum co-founder. </p>