>>3988109She is the creator of the world, so to speak. She has seen the rise and fall of countless other vtubers like Kizuna Ai, or The Four Heavenly Kings. If people think streaming to 2000 live viewers seems sad, remember that Sora started with just 13. That is a kind of confidence which newer holos can't even begin to fathom. Sora is mentally tough as nails, even if she seems gentle, and her unique experience sets her apart (hence her "alone" depiction).
She is also the quintessential idol face of the company. There is nothing yabai related to her, and she is corporate-friendly, advertiser-friendly, and merch-friendly. That's a skill.
Lastly, though it has taken a long time to get to this point, her singing is actually pretty nice, if you give her songs that suit her vocal range, which is operatic in nature.
https://www.youtube.com/watch?v=vpC98I4xHd0 
