Please see the rollback thread here, or in its archives, later on:
https://meta.wikimedia.org/wiki/Meta:Babel
Rollback removes material without an edit summary. This often looks like vandalism to others. It can severely mess up the flow of talk pages. It can discourage and baffle editors, especially newer ones. If these editors try to repair this "vandalism" they are quickly reverted, often again without an edit summary. Or with some very cryptic edit summary full of acronyms like "LTA".
This can drive away some editors, and Wikimedia needs every single one to revert the decline of editors in some wikis.
Need some plain English edit summaries that are actuated by default.
Nothing between clicking the rollback button and the actual revert. The rollback function uses the last used edit summary. Without any confirmation clicks. The editor can pick another default edit summary from a list at any time. That default list is in plain English, and is built in to Wikimedia.
That list also has a section for adding more edit summaries by the editor.