As someone that consults in this space I more or less agree with you. Requirements are derived from interpretation of UETA and ESIGN Act. Itext has a good write up and great library to leverage when taking on project like this. Docusign has a good writeup on esign/UETA. ESRA is the goto body on the subject, and if you need legal opinion DLA Piper is the goto in the industry. This stuff is fairly simple once you know it.