Microsoft needs to jettison more legacy so they can move faster.
Move faster to where?
Move faster to where?
Can you name me one IDE that has more features, fewer bugs and better profitability than Visual Studio?
I respect that Microsoft are not at the top of all fields they're involved in (search, mobile, etc...), but they aren't exactly struggling to stay competitive with every product they create.
Rather, that the goals of pretty much everyone in the software business are features, fewest bugs possible, and most profit possible.
I'm not even sure I agree with the great-grandparent post that MSFT needs to jettison legacy. Frankly, I don't know enough about their numbers to have an informed opinion. My point was that it seems pretty clear what the poster meant by "move faster". So the question "to what?" isn't all that helpful.
To be honest, I find that strange. Moving faster without setting goals about what you're moving faster for (other than profit) seems like a good recipe for dilution of focus. A company requires focus in order to maximise efficiency. Building up spare capacity just to buy time to run around like headless chickens seems like a wasted opportunity, from a business perspective.
If you are Microsoft, jettisoning legacy means jettisoning customers.