"To understand why PWM bulbs have so much flicker, imagine them being controlled by a robot arm flicking the on/off switch thousands of times per second. When you want bright light, the robot varies the time so the switch is in the 'on' mode most of the time, and 'off' only briefly. Whereas when you want to dim the light, the robot arm puts the switch in 'off' most of the time and 'on' only briefly."
It's entirely fine if the rate is high enough, but lowering the frequency of the PWM and using smaller inductors (or even no inductor at all) is a prime way to make the bulbs cheaper.
This the reverse, actually, you can use much smaller inductors the higher the switching frequency. That's why the GaN chargers are so much smaller, for example.
Smaller relative to the requirement for the frequency: you can cheap out both using lower frequency components _and_ using a small inductor than you should be for that lower frequency (or again, not using one at all at that lower frequency because it's still higher than the eye can directly perceive and you think that's all that matters)
"To understand why PWM bulbs have so much flicker, imagine them being controlled by a robot arm flicking the on/off switch thousands of times per second. When you want bright light, the robot varies the time so the switch is in the 'on' mode most of the time, and 'off' only briefly. Whereas when you want to dim the light, the robot arm puts the switch in 'off' most of the time and 'on' only briefly."