Why is web-based software better than downloaded software?

Web based software offers you the following advantages:
You do not have to take the chance of uploading software that may have malicious viruses attached to it.
It allows you to work on your project from multiple computers.All you need to do is log into your account.
You will receive immediate updates to the software so no need to keep up with version updates.
When you are finished with your photo book, there is no need to delete the software off your computer.