Why the ceremony around signing with on-screen mouse movements, if the resulting digital signature could be copy-pasted into any other draft?
They handle the steps of making sure it's a compliant, legally valid signature, which is great.
However, a lot of the ceremony as you called it is not required to make it a legally binding signature, it's mostly to make people feel like it's legit.
We may take this in-house at some point to streamline it, but Dropbox has been a good partner to us, and I'm grateful that they enabled us to get up and running quickly.