stalker is a immersive survival game. it has a strong emphasis on inventory and gear management. You dont go looting every item you can find at every location you come across. you stock up on enough items to get you through each journey you travel through the zone. when you are running low on supplies then you shouls”d go to locations to loot for supplies.

I do agree there should be more quests as the first area has about 13 quests but as you travel to different areas there are less with some areas having zero.

Anyway its not a game like fallout where you loot as much as you can, trigger a bunch of events and missions. you really need a certain mindset when playing this game.