Oversaturated, unnatural iPhone color

All phones (and even digital cameras) do this to some extent, though some reflect reality better than others. Are you using the automatic settings on your phone when taking pictures? Often, the automatic settings are okay when you need a quick shot, but you can probably get better results by taking pictures in manual mode. There should be a way to adjust your settings and take pictures in manual mode so that it takes photos with the parameters you set (focus, white balance, exposure, etc.). Start with a test shot and adjust your settings so the picture looks as close to reality as you can get it. You’ll still have to adjust the focus/exposure yourself every time on the camera, but that’s probably easier than editing every single photo afterward.