The signature feature within forms is a great add-on! There are just a couple things that prevent it from sufficing as a true e-signature that would allow it to be implememented more widely:
Type to sign, as opposed to handwriting with a computer mouse
Option to require Monday sign in (to prove a user provided signature on their own behalf). This would be helpful for obtaining internal signatures for official processes.
Thanks for clarifying @cfish! This is great suggestion, and I believe such additions would add great value to the usability of this feature! I will go ahead and share with our workforms team!