We have one at work that does this. Super annoying. If you put it at 5/10 it’s full blast 3 seconds and then off 3 seconds. It’s probably prevalent on cheap models.

Maybe not temp control, struggling to find a word, but a constant power flow instead of the on off duty cycle

Check out impulse labs. I think you’re gonna like those knobs

Aaand actual temperature control. Not just on/off 100% power.