One particularly crisp summary, from Susan Hennessey:

Just to clarify what is going on here, the White House appears to be engaged in massive, systemic abuse of the classification system and underlying presidential authorities in order to cover up egregious wrongdoing including impeachable conduct. This is a historic scandal.

Also self-incriminating. They can’t use any “we didn’t realize it was wrong” defense because they hid the records. Watergate all over again: chorus: It’s not the crime it’s the cover-up.