> potentially even allowing functions to become small enough that they can be inlined
Apparently, that's no longer the case, at least in V8[0]
Parse times however are indeed a real concern and start to matter a lot as you go down the list of mobile hardware and their performance. This graph[1] shows parse times for a 1MB bundle of JavaScript in various devices.
Yes, but performance differences between various devices are still fairly significant, as per your own link[0], meaning we probably shouldn't disregard potential performance gains from minification in slower devices.