According to Alan Dershowitz a president can order an investigation of any individual to be dropped for any reason. He says that there might be political ramifications, but that the president’s authority here is pretty clear.
If that is true, then obstruction of justice is an issue only for those people who mis-understand (deliberately or otherwise) presidential authority.
WaPo isn’t interested in impartial legalities. Bezos’ blog embraces or dismisses rule of law based solely on its usefulness at destroying Western Civilization.