It should be within the technical capability of each condenser to scrub leading characters for any Steem permlink and replace with their own while rendering the page (e.g. Steempeak can replace all Steemit links with Steempeak links). My understanding is that Steemit does not do this (and does not render permlinks without the leading domain as valid links) so we try to use steemit links for our readers to have a better overall user experience.
That said, we usually post our updates through busy.