Webinar registration form for people in your org: why firstname, lastname, email mandatory?

Hello dear community,

I don't get why First name, Last name and Email are mandatory fields when creating a webinar for people in my org. 

From my unerstanding we already have the info and forcing them to double-encode their contact info is a waste of time. 

I would just want them to opt-in the webinar and maybe provide a glimpse on their expectation, but no dumb double encoding.

Or at least we should have the information pre-filled...

Or maybe am I missing something?

Thanks!