Because it means that if you buy a fixture with built-in LEDs and a more reliable power supply it'll be a very reliable light. The problem is that trying to cr

Because it means that if you buy a fixture with built-in LEDs and a more reliable power supply it'll be a very reliable light. The problem is that trying to cram a tiny power supply and a hot LED chip into a small bulb without a good heat sink is inherently unreliable. Especially if you put that bulb into a completely enclosed light.