It's not the simplicity of the form as such Gary, but the convenience of having it incorporated and having the ability to generate as many as you like right from your site without a widget and without having to pay anything after a certain amount of clicks and email returns.

Adding a form generator should, IM, VERY, HO, should be just as easy and simple as adding a graph, a table or indeed any manner of addition without a specific widget above and beyond the simplest. 20 years ago, I know it is very different, but a buggy program like MSFP would easily open a form dialogue and have a dedicated page with tick boxes, as many as you like with expanding multiple drop downs and the like, with a final, editable, submit box for an email response and a return to a thankyou page, which you could then just click through onto your homepage or whatever. It was very simple, expandable if you wanted it to be so, and didn't rely on a third party.