alt Hacker NewsAn example near the start of that article is
>Physics was originally part of philosophy, like Isaac Newton's observation of how gravity affects falling apples.
like back then people would wonder how apples fall and it was labeled philosophy. Now we understand gravitation it's part of physics for the most part. People launching satellites seldom call a philosopher to calculate the orbit.
It remains to be seen if qualia, which we don't understand very well and are so regarded as philosophical, make the transition to neuroscience.
The fact that we have sharpened our classification of sciences over time does not imply that philosophy is a study of the ill-defined. It implies the opposite: Philosophy is more precisely defined now than ever.
If you read the rest of the article, you will see clear examples of what is considered a philosophical problem and what isn't.