>>41255186>>41255480>What incentives are there to grind in the Wild Area?
Dynamax raids, curry ingredients, catching Pokemon.>Are they story-related?
No, as completing Dynamax raids does not progress you through the story and is not required at any stage.>Can they be left until after the main story (ie. postgame)?
If it can be done outside of the main story, it's not part of the main story. You can spend hours in the wild area before the third gym, or you can spend hours shiny hunting in any previous Pokemon game. This cannot reasonably be counted as main story completion time, thus the 10-12 hour completion time reported in blind first playthroughs.
Sword/Shield have by far the shortest main story of any main series Pokemon game.