When forms are changed accidentally, this feature would be useful to directly help restore the previous versions (like in Google Sheets), rather than having to identify and, recreate all the 20-30 forms. It is easier when there is only one form to change. But at times when a HubSpot subscription is changed, we could lose a feature and the forms can get automatically modified. In this case, having the ability to at least view, the previous forms would be great. By viewing the previous form version, we know what were the fields, and how they were asked. This will help reduce a lot of work.
{This is out of my personal experience, we had a change in the subscription, and the forms were all automatically modified. I had to re-create all the forms.}