Does anyone really use thumbnails when inserting an image attachment? Is there a way to disable the option and remove thumbnails images from my system? Seems like a waste.
Since the list of attachments below the post actually has thumbs for them, though admittedly quite small, I see no reason to ever use thumbnails myself. I always go full image, since it resizes to the width of the post anyway. I don't disagree with you
On most sites I run I set it to 200 pixels or wider, so it's more of a smaller image to not clog up the post vs the full image, rather than it being an actual thumbnail.