I could have sworn, we had clear @rules that explained what powergaming is and why you shouldn't do it, but it seems this has changed or I am misremembering things.
A little bit of prose can add a nice flair to a description, the problem is that this can be a slippery slope if you do it too much as a narrative resource or if you do it wrong.
For example, you could compare a physical trait to something else that resembles it physically. JoeBaka's hair looks like fresh blades of grass after the morning dew on a winter day. Instead of just saying: JoeBaka has light green spiky hair that has been combed and styled with hair gel. One is more of a pretty metaphor and the other is more bland and literal. Ideally you would want to stick to the second one (closer to facts), even if the first one reads more like a cyberpunk novel would.
The problem with using metaphors is that we can very easily step into 'powergaming' territory. By powergaming in his case, we are talking about telling other players what to feel and think about your character (taking agency away from them and forcing your own) and also describing them in ways that overly embellishes them misrepresenting their actual game stats and creating a false perception of them.
For example: JoeBaka has powerful arms that look big and strong like oaks trees and he moves around with the ferocious dexterity of a wild tiger. His eyes are beautiful and mesmerizing, sending anyone who gazes upon them into a enamored trance.
Now imagine that JoeBaka is an immigrant or a character with not so amazing stats or appearance descriptors. With that description I am powergaming, I am misrepresenting how strong and agile JoeBaka is and I am telling you that you have to think and feel they are imposing and at the same time I am embellishing his attractiveness ridiculously (Got to look good for that ERP right?) and forcing you to believe all of this is true, when in fact its not only an utter lie, its also pretty much cheating.
So you can do the prose thing right, but you are most likely going to do it wrong by accident or on purpose if you are doing it too much in your description.
It doesn't matter how many awards of pretty descriptions you won, if the staff tells you to tone down and change your description, you should do it or otherwise you might be breaking rule 4A.
Overly embellished powergaming descriptions are one of my biggest SD pet peeves and are the reason I quit one of my favorite archetypes forever, because I'd wager that regretfully at least half of the player-base has these types of descriptions to one degree or another, and sadly the staff doesn't have the time to go through each character one by one telling them how to correct them or tone them down appropriately.
This is just my personal preference, but if you have an embellished description that I feel is disingenuous I am going to avoid you like the plague and if your description is longer than three paragraphs I am going to skim it and never remember what you look like for the most part. Because if I get too distracted reading your wall of text, I might not notice JoeBaka who has been talking to me or attacking my character for the past 30 seconds. SD unlike other text games, is a lot more fast paced and nobody has the time to read how in love you are with your own character or at least I don't.