>When I send an email that isn’t bounced back, or better yet, get an auto reply with a ticket number, I’m a lot more certain it’s going to get read.

An "auto reply with a ticket number" is not a feature of email, it is something that someone built that could just as easily be attached to a webform. Plenty of webforms work that way, I have personally built some in my career.

Sounds like a characteristic of the responder system more so than the input system.

Whereas what’s clearly a distinct advantage of a web form is that you can find it on the web.

The assertion is that one is easier than the other. But regardless I’m never confident about sending an email to some generic email inbox.