I spent 5 years shooting stars with the wrong white balance
Tbh I only figured this out last month when I was stacking some shots of the Orion Nebula. My buddy looked at my raw files and asked why everything had a blue tint. I always thought you just set it to daylight and called it good. Turns out for astro you should really shoot in raw and fix it in post, or use a custom balance off a gray card. Anyone else waste years on a setting they thought was fine?
Pick up a DSLR for the first time and nobody tells you that "auto white balance" is basically a lie for everything except bright midday sun. Same thing happens with TV settings out of the box they're all cranked to "vivid" and we just accept it for years. Honestly once you start questioning one default setting you realize most of them are just optimized for whatever's easiest to sell, not for actually looking right.