I don't agree with this because whenever you write something it becomes obvious that it is your opinion, even if it shared by other people. If it is somebody el

I don't agree with this because whenever you write something it becomes obvious that it is your opinion, even if it shared by other people. If it is somebody else's opinion and not yours, you would naturally say "somebody else's said ..." If you want to emphasize that is just not your opinion, you can also say so. It is much more cumbersome to keep adding "I think" when it is implicit in the context.