Actually large LCDs (>65") were pretty uncommon in 2010 but if you ever watched a 1080p DLP television I would be surprised if you didn't notice when looking at them side by side.
There is also of course the issue where people have bad internet (so netflix or whatever destroys the bit-rate, or they have the cheaper 1080p only plan... is that still a thing?) or old cable boxes plugged into 4k televisions.
There is a lot that people can do to inadvertently destroy their image quality without knowing which is not great.