Of course, the GBA was a handheld console, and never officially shipped with actual screen lighting of any kind, unless you count the much later GBA SP and Micro models. But it was also possible to play GBA games on your normal TV using the GameCube adapter, like the Super Game Boy allowed you to play Game Boy games on your SNES in the previous era.
I've noticed that many games, even ports of old SNES games, used a very "bleak" palette/visual look. Everything looks washed out and undefined. In contrast, those SNES games nearly always had very "defined" outlines and vibrant colours.
If the reason for this general "style" is that the GBA had no built-in lighting, wouldn't it be more logical to make them even more contrasting and "defined"? Wouldn't these "pale" visuals just be even more difficult to spot on the GBA screen?
A good example is Harvest Moon: Friends of Mineral Town: https://youtu.be/gvxbjvIdNDg?t=4342
I also remember being shocked seeing the screenshots for "Golden Sun" in the review magazine. Even back then, I thought it looked awful, as if there had been some kind of error with the printing press or something. I couldn't believe how bright/pale it looked.
The entire palette appears to be cranked up, meaning that even "black lines" often come off as light-grey or perceived "bleak".
I did not see the same thing done for the most part for the GBA's predecessor, Game Boy Color, which also had colour and no lighting. What caused them to start doing this for the GBA?