Home made brownies made from scratch need no frosting.
But if you make them from a mix, frosting is needed to kill the taste.
I finally learned to make a decent vanilla buttercream frosting this weekend - I had to test it repeatedly to make sure it was done right. 
Are you frosting advocates the same folks tossing nuts onto/into otherwise tasty pastry?
shudder Nuts are bad, mmkay?
Plain, nut-free brownies are perfection. Don’t detract from them by adding random foods!
Agree with the no nuts sentiment (I mean really, what the fuck are these crunchy bits in my chewie brownie), however, frosting I can take or leave – a good chewy brownie does not need frosting, but I ain’t gonna toss it out just because it has some frosting on it.
I’m pretty sure that a good brownie recipe will be so chewy and sweet that frosting is superfluous. And I love frosting. But I have principles.
Oh my Jesus, no! Why, why in God’s name would you frost brownies?
And whipped cream? I… I have no words.
However:
That’s not “frosting”. That’s brownie with a layer of chocolatey, raspberry-y, cream cheese. It sounds fantastic, I’ll admit, but is completely unrelated to the question at hand, which is “frosting”.
Frosting. Bleah.
For what its worth, I would have gone with unfrosted up until a few years ago. Once I was diagnosed as needing a gluten-free diet, I find frosting is almost required for gluten-free recipes as they tend to be a little dry.
As my computer so rudely disagreed with me and refused to let me post, my Bakers’ One Bowl Brownies taste best frosting free.
My cakes, baked from scratch, of course, receive the home made frosting treatment.
I voted plain. It may be delicious, but like kaylasdad99 said, if you add frosting it ceases to be a brownie.
A respectable position. I think it’s frosting, in the same way that a layer of plain melted chocolate cooled to a thin shell is a delicious frostingish topping for brownies. But reasonable people may disagree on definitions.
Some people are satisfied with mere magnificence. If that’s you, then sure: rest on your laurels, never seeking to achieve the next level of transcendance. But some of us know that there is always a greater glory out there.
Mmmm, nuts in pastries and brownies.
A good brownie needs no frosting-- but many brownies are not good brownies!
I don’t like frosting on anything.
Frosting on brownies? Yuck. And no cake “brownies,” either please. Nuts I can go either way on.
If they want frosting, let them eat cake. I’ll take mine chewy and unfrosted, kthxbye.
You don’t like cupcakes?
The answer to this question is unfrosted, but frosting isn’t entirely evil. Okay, now I want cupcakes.
As I clarified earlier I’m not truly anti-frosting. Just anti-“the amount of frosting that is put on stuff.”
Cupcakes are just about the worst offenders on this score. And there are no tricks to avoid having to scrape three pounds of frosting off a four ounce cupcake. At least with regular cakes I can wait for a middle piece and then cheat the slice a bit so it is on an incline, maximizing the amount of cake volume to frosted surface area.
Then add to that the fact that while frosting can be good, many are not adding anything to the show other than a boatload more sugar and fat and all things being equal the net value of frosting in general is negative.
No frosting, but you must have nuts.
Ah, I missed the clarification. I was so stunned at the idea of someone not liking cupcakes that I could read no further. I agree with you. I do like frosting, but it has become at times a substitute for good baking. “Guys, let’s just throw some frosting on some dry-ass bread and call it a day.” Not acceptable! I often find myself scraping frosting excess of cupcakes as well, but the right amount on the right cupcake makes the sun come out. God, I love cupcakes.