Some pages use the same on change microflow (or other on-event microflow) and it seems that you need to set each one manually. If you add a new field to the page at a later date, you may forget to check if the attribute has the on-event microflow added, which may cause some missing commits, etc. in production.
It would be nice to have a default On-Event microflow option per page (or page data view) or at least the ability to copy the On-Event microflow from one attribute to another, rather than selecting (browsing) on each attribute