You are comparing a $40 billion dollar telescope to a private persons iPhone?
Are you daft?
The so-called 'UFO' pictures from half a century ago often showed better detail than the ones we see today. Back then, hardly anyone carried around a camera at all, and the ones that were carried around weren't much good anyway. Now, when most everyone is carrying around a pretty good camera, why are the pictures of so-called UFOs much worse?