I was just thinking about this over the weekend, how only one character has the tag and why not others? My initial thought is "are there enough known neutral characters" to make it worthwhile to have them all team up. For instance, if Wampa was switched to neutral would it make sense to put it with Hondo?
Neutrals probably shouldn't have abilities which work with other neutrals, but with their other tags, because LS units at least agree they're LS aligned. This might make things more complicated when adding more characters who are neutral, because while they have neutral alignment in common, what does that really mean? LS goal is to stop the DS, and DS goal is to beat LS. Neutrality really has no goal but to stay out of it, side with the highest bidder, or side with the most dangerous for safety. And if you think of it there were probably more times in the movies and shows where neutral factions sided with the LS to go after the empire.
Changing current characters to neutral is also challenging, because some characters straddle the line between the sides. Are all BH really DS, or would some become LS for the right price? But we see them as DS in most of the content. What about smugglers? Technically Han was working for Jabba as a smuggler, at least for one job. I wouldn't say he's DS or neutral, based on the side he ended up on. Now consider how this could affect current teams by removing units from lineups, and possibly even ships down the line. Until we have a neutral fleet the neutral ships are useless. And if a ship has more than one pilot does that ship count as LS/DS, Neutral, or both?
Just things that would need considering.
To me this game has been bandaging its releases for years. Character X releases with a cool ability most characters can't do anything against. Character Y releases to counteract X's ability by giving Y a cool ability no one can counter. Then comes Character Z to fix Y, etc. And datacrons feel like an extension of this to help older characters be temporarily more useful.