Currently, public sub counts are abbreviated in most but not all places across YouTube. In August, we’ll make this more consistent by always showing abbreviated sub counts publicly. Creators: You’ll still see your full sub count in Studio! Learn more → http://yt.be/help/abbrev-count …pic.twitter.com/pmaKk4EU4k
I understand you want consistency throughout the YouTube website and app, and I agree. The problem lies where the majority of the users of YouTube, the viewers, would rather see a precise number of what the subscriber count is. (1/?)