Mainly cause you never know what you’re getting. Over time, we trained our minds to believe that a well put site = effort, so at the very least people behind it cared. Now, it takes zero effort to make a site look good. So appearance in general means even less. In fact, now a poorly put together site might mean someone cared, wrote it by hand, flaws and all, to give you the human to human experience.
If there is a silver lining in all this, this might get us to appreciate the flaws in all humans, heck even yearn for them.