The rep penalties for trading with a faction's enemies in a contested system are ridiculously asymmetric at the moment.
1 cargo run of 200 supplies to Ragnar Complex earned me -22 rep with Tri-Tach, yet only +5 rep with Hegemony.
That's an obscene loss, given how long it'd take to regain such a rep loss.
Moreover, there are only two possible results to this behaviour:
- Contested systems become no-go areas, because any action in them will result in rep loss.
OR
- The rep loss will cause 1 (or more) factions to go Hostile to you, making 1 (or more) other systems no-go areas to you.
Either way, part of the map has become effectively inaccessible to you, lessening the sandbox, and depriving the player of content & choice.