Some people like a lighter weight and different grips. Lots of cases have a kickstand where you can prop up the deck and use your favorite controller.

I’d guess it is because the most popular way to acquire games for Citra was Nintendo’s own servers

Can confirm. I struggled to remember the name of the ancient website vampirefreaks after the concept came up in conversation and out of the big search engines only Bing’s flavor of chatGPT could tell me what I was looking for.