With that said the tablet has become the device to do those things on. It let's you sit on your couch and watch cat videos on YouTube instead of having to sit at your computer or to have a laptop.
Tablets will become the new home PC. So Microsoft is just going with the flow.
You have made the same mistake that Microsoft have made. They looked at the trend for desktop PCs and decided in 10 years no one will have one if they follow the sales graphs.
But the market did not die. It merely split in half. There are people that generate content and people that absorb content. If you want to absorb content, you get a tablet. Light, easy to use, made for idiots. But if you want to make something, you need a PC.
Employers don't want their staff sat on beanbags mindlessly swiping and poking tablets all day. They want them sat at a desk being productive. Microsoft have completely missed this and are busy shooting themselves in the foot. So much so that my office only has Macs in it. Companies are leaving Microsoft because MS don't know what they are doing.
They should have made 2 OS systems like Apple do. One for tablets/phones, one for PCs. Trying to make windows 8 all things to all men was incredibly dumb. The result is no one is happy.