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Although I wasn't fond of them being strictly daily hubs, the idea of adding new portions to the existing planets independent of the main story sections was a good idea that seemed to have tapered off too quickly. They're efficient for the art departments because they re-use existing art assets, so I'm surprised they weren't already a part of the Forged Alliances content. Which planets would you like to see a new Section X-style area?
I'd personally like to see a Jawa-specifc storyline expanded on Tattooine, following a smaller Jawa tribe(that can't afford their own sandcrawler yet) around a trade route, clearing a path through sand people and wildlife, with some haggling dialogues that would be semi-randomized where you can butt in and help their sales to moisture farmers and market bazaars. Also an expansion area to Hutta, with a split between undeveloped swamp and an industrial/settled area. Don't care for the indigenous races, but it's a planet with potential, especially if the shuttle to the higher level area is stuck out in a questing town that lowbies would see co-mingling. Even just some additional datacrons with small stat updates and some jumping/exploring like the fleet group puzzles would be fun.
I'm also annoyed there hasn't been much additional use out of the "light bot" technology you see in the one Section X mission in a dark warehouse. I only saw it re-used briefly on CZ-198 in the garbage-tentacle mission and the original was really unique.