I know from personal experience far too much information is classified. Simply getting rid of “confidential” wont do much as it would simply become Sensitive but unclassified.
Pretty much the same security requirements.
From what I’ve read most of Hillarys email server data was Top Secret and above.
Will probably push that info to be marked secret, not SBU.
There are still plenty,of other things these would,fall under.
Noforn, internal use only, like,you said unclas but sensitive, etc
The only reason to get rid of it is so people like Clinton don’t have charges thrown at them for removing classified info.