system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do most things bake at 350 degrees?
gpt
In most baked foods, the goal is to achieve a nice browning on the outside and cook things properly inside. To get this most foods like cookies, breads and meats (and toast) rely on the Maillard reaction.

The Maillard reaction occurs at around 300F (there is a range 280-320 ish) and most ovens are imprecise enough that setting it to 350 is more reliable. And there needs to be a buffer because 300 is the target temp of the food to be cooked not the temperature as measured by an external sensor. 

If you bake below this temperature, things will still cook but will be left pretty colorless (and lacking in the taste that develops through the browning)

The temperature cannot be too high (for most foods) because big pieces of meat and breads might burn/char on the outside before the inside is safely and tastefully cooked. So 350F is used as a compromise to give the best combination of cooking thoroughly and still having enough browning.

For some breads it would be safer to set a modern oven to around 325. For flat breads that cook quickly, possibly higher. For roasts, it is normal to start at a high temp 450 and then reduce the temps to allow the meats to cook through.