It wouldn't be micromanagement hell if the game told you what populations could live there. Could have a system level icon for your own population like there is now. Green star means your population can live there comfortably. Red star means not-so-comfortably. When examining the planet, it can show habitability Ratings for each known species. Could make a switch somewhere that changes the system-level icons to be for a population other than your own. More detail doesn't always mean more micro-management
The coordinates don't need to be taken to extreme numbers of decimals. A simple map having a 130.0x130.0 system would be fine (and still quite an improvement over the current 13x13). Newtonian movement wouldn't be feasible with the grid now used in SEIV, it would be far too choppy. There would still be a "grid" for combat purposes, so ships don't have to be at the exact coordinates for combat, just within a certain block.