to cook rice correctly, you need to have it come to boil and then lower temp to simmer.
The rice cooker does all this automatically, I guess I got used to it when I was in Japan. I got heck from a Japanese lady when I lifted the lid when she was cooking rice, with a rice cooker you dont have to look.
We cook all our rice on a rice cooker. Its not expensive to get one, its handy and frees up space on the stove. (soon as the rice is done it switches to Keep mode)

reminds me of the Tom Waits line, shes been married so many times
she had rice marks on her face.