That's really one of the good parts about Valheim.

You are not really forced to "complete" the game in any way. You just play it how you like it, and if you're not much into building beyond the absolute necessities, hey, that's absolutely fine as well.

I probably would never have the stamina nor will to build anything gigantic and too elaborate, I just stick to my cabins and farms, thank you.

But I do like to make them homely and nice, and I do tend to spend many hours in resource gathering, building, decorating and refining them. Probably easily two thirds of my Valheim time is spent on that part.

But you don't have to! That's one of the freedoms Valheim gives you and a very well thought out one at that.