Yeah given that they're doing Vita/PS3 multiplat on Project Diva, it makes sense to differentiate the 3DS game
Maybe Project Diva isn't a game built on having a nice looking main character, but I sure thought it was. AKB definitely is, and the chibi 3DS version may actually never sell out its first shipment. At least Project Mirai was able to do that (+50%).
From Media Create 2012 Top 500,
132. [3DS] AKB48+Me (Kadokawa Shoten) {10/25/2012} - 78,811 / NEW (40,542, 28% => 145,000)
Well, maybe when there's a Nintendo device with a screen big enough to display no-chibi Miku in all her...vocaloidic fashion. Don't you remember? SEGA said they tried with a classic Diva look, but they thought it wasn't good on 3DS screen, so they went with the Mirai look.
Hmmm. Didn't know that. Why not just use the PSP models, then?