Some were produced that were claimed to be dimmable - and I wasted my money on a few and was still unhappy with them. The other problem I forgot to mention earlier was the startup time: the earlier bulbs (and the cheaper ones) wouldn’t just ‘turn on’ when the power was turned on…they took some time to start making light, and the colder it was the longer it took - this is an aspect where LEDs are amazing - maximum brightness within milliseconds of getting energized.