I have an incubator, because I usually let broodies do it. LOL. And broodies have brains the size of peas and sometimes do weird, strange or awful things. So for abandoned eggs, cracked eggs and for those months where NO hen goes broody, I have incubators. Broodies are not perfect. Some are nearly perfect but first timers mess up often, and even practiced hens sometimes just have mind farts, and you end up with eggs abandoned and only half way there. Unless you plan on just dealing with fate, and I didn't like that much. I ended up getting an incubator for the emergencies. And once you have an incubator... it screams when it's empty.
So sure, if you have a hen that will go broody, and not all will. Then that works. I've had hens who can raise ten out of ten every dang time and I've had hens who can only get half to make it, and hens who can't keep a chick alive to save their souls, despite trying. They're as individual as people, some good, some mediocre and some awful or homicidal.
It's a matter of learning your birds.