This also happens with posts that are inside the topic but here we can't do anything about it, another matter. I wrote an extension for that already.
The problem as I've said has been shown to be massive with the last post of a conversation, we have clear examples on this site as well.
Leaving intact the possibility to quote in full a post in
topic-review
, I think adding an option is the right thing to do. I know there are extensions for this but I think it should be offered natively: Exclude QUOTE from the last post if the admin thinks it is necessary
I offer to write the PR if I find that this proposal will be well received.
https://tracker.phpbb.com/browse/PHPBB3-16945