I guess it boils down to the letter of the law… :P
Man, unleashed a can of worms here clearly! To be perfectly honest, I don’t mind too much which convention is followed, as long as it’s followed consistently, which is why the biggest bugbear for me in all this is the difference between the app and the website. Clearly people don’t mind the website doing automatic capitalisation (as that seems to be a pretty well-established feature), so in my head it makes sense to roll that out on the apps too.
However, as one of the staff said above that wouldn’t likely be a priority (understandably, this isn’t that big a deal!). That being said, I think I will put a feature request in for that consistency, so other people can get behind it if they like. :)