When Sibelius and Musescore convert notation to tab every note is presented in the lowest possible position. This can produce tab which is impossible to play. It is then up to whoever is producing the score to decide which notes are played at which fret on which string, and reset the tab to match. If I am notating a piece I can already play then the fingering is already worked out.

If I was doing a piece for two or more guitars, the notation would be done from the basis of the sound of the music rather than how it would be played. The tab would be a result of trying to play what was written and finding the best way. If it turned out that a part was unplayable, that part would have to be re-written.

If some one had worked out how to generate playable tab from notation that would be amazing. Where you play stuff on the guitar neck can be affected by whether or not you use dynamics like hammer-ons, pull-offs or slides and whether you select open strings or closed box playing.

There can be more than one solution but I suppose editing could take care of that.