I think the many cases of regular officials having classified documents in private residences is a more a sign of a systemic issue of how documents are classified and handled within Washington. Things are classified when they shouldn’t need to be, and sometimes you receive thousands of pages of documents you’re expected to read. With Pence/Biden handling of the classified documents, once they realized they had the documents, they went through the proper channels to disclose this and get them to the National Archives.
Trump did the opposite and it’s clear he showed he knew he had the documents and withheld that information from his lawyers and the National Archives, even going so far as to moving records around to hide where they are. This isn’t a normal situation of accidently having documents, there was clear criminal intent, which Jack Smith’s statements have shown. Treating Trump’s behavior equal to that of Biden or Pence or whoever is disingenuous.
Dealing with a criminal ex-president who is running for reelection has never happened before to the country, so there’s not an operating procedure to follow.