Does sprinkling salt on top of brownies give the same result as putting it in the batter? Standard recipes for brownies have a teaspoon of salt in them. Questions like this one and this one explain that it's only for taste. Can you just put some salt on top after they are baked?

For example, the linked answer might imply that yes you can just sprinkle salt on the baked brownie afterwards. But is that true? I also don't understand the comment about "raw flour". None of the flour should be raw after the brownie is baked!
Sprinkling salt on top won't have the same effect as mixing it in the batter, you'll get a big salt hit all at once and then nothing in the brownie itself which I wouldn't expect to be very pleasant. 

Some recipes withhold some of the salt from the brownie and put it in a sauce for the top like a salted caramel drizzle. This works because it's not pure salt on the top and there's still salt in the batter.