yeah ultimately you are right that there is little to no drawback to posting here first and waiting even a day to post elsewhere. I am not convinced that this makes much difference to the Google rank one way or the other - far more important is if there is a link back on the external site, and you see people all the time posting content here and elsewhere without a link back to steemit on the other sites - that is obviously much worse. But yeah, no reason not to post here first.