Programming, performance vs complexity
Programming almost isn't about performance anymore. Performance has to be good enough, but most problems are small enough that's pretty easy. Most of the programming problems at my current and previous job are about managing complexity. We have to write a big complex piece of code that manages lots of attributes and has lots of rules and does lots of actions. We have to do that in a way such that it works in the short term of days or weeks for whatever feature we're adding this time, and we have to do that in such a way that we can come back to it next month or next year and do something completely different.