The person or people claiming the name Satoshi Nakamoto solved a difficult problem. There was a certain amount of creativity required, and a simplistic beauty in the solution. Like many times when a elegant solution is announced, more problems become apparent. It is the very nature of solutions that they expand what people can think about and hence lead to more unanswered questions. In this way, the chain of discoveries progresses on.
Satoshi is not immune to this process of answers leading to more questions. We have seen the successful implementation of Bitcoin, which has led to more problems. One such problem is that fees for transactions are static and not dynamically adjusted as demand for block space or market conditions change. Another such problem is blockchain bloat, which every user that downloads the reference client experiences as they loose over seven gigabytes of free space on their hard drive. Another problem is that unsuspecting users get very small payments many times, these payments can’t be spent as they will not cover the fee of a transaction that will be several kilobytes in size. Of course, there is a viewpoint that these are not problems at all, but rather suboptimal solutions.