The SEC disclosed EDGAR was penetrated by hackers and they had access to company releases early and made market trades based on those releases.
If EDGAR were moved to blockchain where only a company with the private key to it's own public releases were in control, the entire world would get all required filings at the same time with no chance for anything to hack.
Other than the occasional corporate private key being compromised which would happen no more often than Edgar passwords are compromised.
Some government's attempt to discredit blockchain and attempt to destroy it's value proposition but the real value is almost limitless for many industries including document filing and public release.
News on SEC Hack:
https://www.reuters.com/article/us-sec-cyber/hack-of-wall-street-regulator-rattles-investors-lawmakers-idUSKCN1BW25J