Well, I mean, how often do you really need a consistent heat source? What sort of things is it critical you don't have heat fluctuations? I'm coming from a lack of upper level chemistry experience/lab classes.
Exactly. Imagine you want to boil something flammable with this hotplate. You keep increasing the setting but it isn't boiling. You wait. And wait. Nothing is happening. You increase the setting a little further and WHAM. The hotplate goes into overdrive, overheating the solvent which boils with such force that the glass joints are blown apart and the apparatus falls to the floor. The boiling solvent fills the air with a cloud of flammable vapor, searching for a source of ignition.