in the 24th century the metric system finally made it.
Most likely you're watching in 720p. In Chrome, Firefox and Opera you're getting 720p max. To get 1080p you need to be watching in Internet Explorer, Safari or on a Chromebook. To get 4k you need to be watching in Edge and have a 7xxx or 8xxx Intel CPU and HDCP 2.2 enabled display. Source: https://help.netflix.com/en/node/23742
One of the more interesting theories I've heard is the link between the housing crisis and the retail crisis. When you live in a tiny shoebox, the last thing you need is more stuff. Back in the days people had comparatively huge houses all to themselves, and could buy crap to their heart's content.