[ghaff]

Essentially all validation/verification is some tradeoff between:

1. convenience

2. certainty that someone is who you think they are and they meant to give their approval

3. a "paper" trail

4. And the consequences if you make the wrong call on 2.

For many, but not all purposes, Docusign (plus SMS in many cases to get a code) replaces a lot of fairly routine paper shuffling. It also depends on what a given, often financial, organization has deemed acceptable risk.