See for example the enwiki RfC about long edit summaries which lists Automatic edit summaries ... which add the entire wiki text content into the edit summary as one of the problems.

Currently the automatic edit summaries are cut of at an arbitrary 255 characters (or is it even bytes?), which is sometimes just to short for automatic messages. One of the main drivers for the other ticket was the lengthy summaries when reverting IPv6 edits, and as far as I can see, the advantage of the increased length was unchalenged for this use case. Here it's similar: The automatically generated message when creating an article should, to be helpful, include about the first sentence of the new article. That works better, the more space there is (particularly since about 100 chars are already used for the "The page was created"-prefix).
This ticket really is only about automatic edit summaries, and that part seems not to be questioned, as far as I can see.

Additional finding: The same applies when performing revdel on a log entry, see https://de.wikipedia.org/w/index.php?action=historysubmit&type=logging&revisiondelete=1&ids%5B111542788%5D=1 (admins only). We remove very abusive user names from the newaccount log, since we have a bunch of vandals on dewiki who create offensive user names by the dozend.

I guess this should be implemented such that:

• There can be a global list of pages any blocked user can edit (maybe except if he also has "allow talk page edit" rewoked).
• There can be a list of pages a specific user can edit despite he's blocked. This should also include cases such as "all pages in user space"