You are 20 years behind. 4.0 was the very top when you and I went to school. Then grade inflation made 4.0 as common as dirt. So they added "honors" classes which could push you over 4.0. Then grade inflation took off again because they dumbed down the honors classes.
Why did they do that? Because minorities were underrepresented in the top achievers group. To fix that and create rewards for the truly brilliant, they created "Advaned Placement" classes to push GPAs into the mid- to high-4 range.
I'll give you one guess as to what's happening now.
My sister is a teacher and I get an earful about this stuff all the time.
Grade inflation didn't take off until about 15 years ago and has really picked up in the last 5.