I've had mixed success with dimmers & fans. Some fans work well and you'll get a good speed range. Others it's not much better than on/off.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk