Simple - we want you and all witnesses to tell us what happened as quickly and easy as possible. Others ask you for the contact details of witnesses and then send the witness a letter. The trouble is that witnesses usually forget vital details critical to the outcome of your case.
It’s happened to us in the past, we would rather not have it happen to you.
You're welcome to type out your statement, but we thought we'd at least give you the option to record a video and save a ton of time.