o(n^3) bugs happen, sure, once every two year. So the 99.99% rest of the time, wondering about it is useless... Just as much as nitpicking over which version of Eclipse or gradle or whatever to use. In the grand scheme of software projects, these are not super relevant. Making code robust to crazy unexpected inputs is much more important. Making code that is easy to read (that is, readable without knowing tons of frameworks or technical details) is much more important.. At least in business computing.

Now they are niche when these issues do matter...