After over a week of trying to get a meeting with @TeamYouTube we finally have one scheduled for an hour from now. If you have any constructive feedback to share with them regarding the abbreviated subscriber numbers (via the api), reply to this tweet.
if they at all want more feedback: I'd say if they really want to make it consistent across all platforms, then make it more exact. make it so everywhere displays the exact number, or most precise possible. Fixing consistency by making it less precise is not the way to go.