I can understand that Battlefront is limited in how much they can improve the game's look given limited computer resources. Given all the ideas mentioned above, I think the most needed visual improvements for the game ranked by order are:
1. improved smoke graphics for burning wrecks & buildings
2. improved building rubble
In addition, I would like to see a toggle option for removing the "Questionmarks" on the map when a spotted you goes into hiding. Similar to what we can do for objective flags or unit icons. The battlefield map is so beautiful and those "questionmarks" spoil the immersion for me when I watch the movie playbacks.
Finally, I hope Battlefront can find a way visually to allow players to better see the map terrain elevations better either through shading, or through the use of some kind of hexgrid toggle option on the map.