That is what I asked the OP to provide in bullet points and why this solves those issues. I want to know why creating an entire infrastructure to solve these varied issues is preferable to correcting them in existing projects. Adding those points to the op would not be the worst idea I can think of either.
Good idea. This is what I tried to explore more in the 'summary' post over at Medium, though I kept it at a technical minimum to make it as layman friendly as possible.
Now some of the issues that the Tangle solves cannot be replicated by a blockchain, so I guess you are asking why we aren't instead trying to incorporate a Tangle in an existing project. The reason is quite simple: it's LITERALLY impossible. Just look at how infinitely slow Bitcoin progresses and how everyone gets a heartattack at the mere notion of making some changes to it. The rest of the technological world will not stop and wait for Bitcoin to catch up. IoT wont, Quantum Computers wont and the economy wont. So we started anew. Another motivation for this choice is simply that we don't believe in these omnisolutions. It's impossible to create the perfect key that opens all doors, there are ALWAYS flexibility trade-offs for adding features.
IOTA is meant to be purely a transactive token in real time, so it makes sense to create this 'pure token' that solves a problem, solves it really well and solves it NOW, not in a hypothetical ~5+ years down the line perspective.