No you don't need to go back. IMO the main quest, or at least the way it is delivered is not great anyway. It's mostly a way to send you around the map to naturally bump into other quests and activities. To ELI5 the story:

I have an almost 20 year old laptop with an i5 and a 1050ti, installed CachyOS and it just works. Afaik it uses igpu by default, havent tried much yet but i can see that the laptop is pretty silent normally and gamee run well with a command that makes them use dgpu.