the funny part of SFSW is by allowing native nodes to continue..
not only will malicious sigop spammers continue to make sigop spam with native keys.
not only will malicious malleation double spenders continue to make malleated tx's with native keys.
 but it opens up new attacks too(even with segwit changing the network topology to be upstream filters to stop automated relay of unconfirmed SW tx's to native nodes) MANUALLY grabbing SW tx's from a SW node and pasting it into a native node. can cause issues

basically meaning segwit doesnt 100% fix the issues
basically meaning segwit doesnt disarm everyone
basically meaning segwit doesnt get all the benefits it promised

and it opens new issues.