Every now and then, there are wrong release merges being made by inexperienced editors and these errors are hard to fix. More importantly, an MBID is lost and wrongly linked to another release. From my experience, it is very rare that releases need to be merged because an editor who adds a new release would have checked if that release already exists. Release merges are usually used to clean up freedb imports or other types of automatic/semi-automatic data imports.
I think there’s a need for greater scrutiny over when an editor can merge releases. At the very minimum, I think beginners should not have their release merge edits applied without three yes votes. There can be discussion on whether this should be applied to normal editors as well. To ensure that these edits are being voted on without much delay, a new report should be made.