no, please. This game isn't no man's sky, bro
If you want realism, better will be, for example, ask your friends "Which sector have city with traders?" he said "Planet DU-22331 Sector3 1,3,37", isn't it?
Combat is a good, of course. We can't play without combat, PVE is not good for fun. But if every boy will have gun in his hands - what will be with your buildings?
A good idea - make weapons that for sale only, and set up very-very high price on it.
It is possible to add in-game researches? For example, you can buy it from sellers on space stations/cities or get by himself? It will be better than chained crafting (Brick -> reinforced brick -> super-reinforced brick etc.)