Here is some of the feedback from myself and my players:
We recently went from SF to PF2e and it feels like PF2e is much more streamlined. We like the game rules much more than SF2, the world and lore is as awesome.
The action economy system is a revolution for our group, we absolutely love it. Been playing TTRPG for 25 years.
What we would really like to see in SF2, is indeed a system closer to PF2 with its own twist.
1. Lore Books a la PF2
2. Get rid of Weapon levels, focus on improving weapons to increase their potential
3. A better more streamlined narrative startship combat system (The one from FFG Star Wars isn't bad)
4.3 Action economy (already confirmed)
5. Similar to PF2, Encounter, Downtime and Exploration game modes. Where a focus on exploration could be put for Space Exploration.
Just our take :)