Is looking through a telescope to do astronomy a thing of the past?
Scientifically there's little to gain when you look through a telescope with your own eyes. Attach a camera to the telescope and you immediately document what you observe and take out the subjective factor from it at the same time and allow careful analysis and more detailed. Additionally you gain improved sensitivity enhanced observation duration and broaden (or narrow) the range of possible wavelengths which allows to gain additional insights.

That said, many professional astronomers still enjoy looking at the sky with their own eyes, be that with or without telescope.