Earlier quoted context omitted.
Could you give a few examples what such frameworks provide that you need, that Go plus a few simple libraries doesn't provide?
Same reason IDEs — when you really know them — allow for quicker development compared to using primitive text editors with a bunch of third-party plugins duck-taped together. When you understand the framework, everything is written to the same standard, behaves in similar ways, and is where you expect it to be. Adding things like background job processing requires changing one line of config. Also, one major thing I'…
I am actually using this for a production site that gets 1 million requests per day.