Making it accessible is just a matter of geometry and the extra plastic material for the larger surface area is negligent in cost. LED chips are more expensive, requiring more electronics and more expensive heat seats, instead of relying on a simple vent hole. And also not to mention that the engineering files for halogen and reflectors have been refined over decades while LEDs is still an ongoing process of refinement, making halogens a quicker and cheaper option to move to market.Actually as far as automotive applications, halogens are not cheaper nor simpler if you consider all variables. designers have to make halogen lights assessable for bulb replacement, leds do not have to be. halogen light assembly needs to be vented, halogens make lots of heat inside the headlight, great temp difference inside/outside creates its own challenges, led can be sealed, and make almost no heat inside the assembly, heat sinks move heat away from the back of the led. I have little doubts in 10 years you probably wont find any halogen headlights worldwide, regardless of the vehicle price. today there are still plenty of factories tooled to produce bulbs and halogen lights, but they gradually getting phased out. another reason may be that there are still active contracts, and well as political reasons.