How many times have you create a meeting request – saved and sent it – then realised you forgot to put the time and date.
You reopen it and fix it – but the other person still receives the original email with an “Updated: xxxxx”

Why would the assumption be every meeting is going to be for the next 30 minutes?

Microsoft, please default it to zero – or give an option in Tools Options to turn it off.

Figure: Microsoft Outlook assumes every meeting is going to be for the next 30 minutes