If answer to any question is yes, then you are at right place.
Not limited to desktop you can create a very robost mobile prototype, confidently present it to your stakeholder.
With axure you can not only just create a design but also share it securely
There is no meaning to deploy a new design without doing any user research. Create as many prototype you want with axure
With axure you can rapidly creating complete user journey through flow chart get early feedback, no extra tool is required.
Yes, axure allow you to conduct usability session starting both moderate to unmoderate on fly.
After create a prototype, you can even make it responsive. That is "awesome". It is like holding superpower in your hand