If you can get by in the expedition without using the expansion slots for multitools, your exosuit, and your starship that you are awarded during the different phases of the expedition, you can take them back with you to your main save when the expedition is over, and use them on your main save.

Keep in mind that you can buy one exosuit expansion at the space station and one in the Anomaly in each system you visit during the expedition as well.

Also, despite the end-of-expedition bug that I managed to get around with the photo-mode fix, I really liked how I could take things back to my main save. It was also very satisfying to get a ton of units and nanites to carry over to your main save, not only for the other stuff in your inventories, but also your in-expedition accomplishments, even those not directly related to the expedition itself.

I sometimes feel that the HG devs don’t respect the players’ time with some of their design decisions, but this was the first time I felt like my time was well worth playing the expedition because it advanced my main save as well, and not just with cosmetics and cool building parts.