I had halogen bulbs in the housings for both high and low beams. The pattern was so miserable that I could barely see anything. There were dark spots where there should be light, and light was spraying around in places that it was no help.
I added some accessory LED fog lights (first white, then added amber covers), and I can see better with them than with the halogen low beams.
Later, I bought HID bulbs for the low beams, 4500K color temperature so I could actually use them. Same issue: light pattern is nearly useless. Thankfully those fog lights are still helping. A few months later, one of the HIDs burned out, and this week the 2nd one died.
This is why I'm considering LEDs.
I bought LEDs for my other car. The first pair was so bad that I threw them away. The next 2 sets were perfect and still are.
While I understand your position about there being no DOT-approved replacement LEDs for halogen bulbs, I would rather see the roadway than just put a candle in a housing. I can adjust the height so I get light where it needs to be, without blinding oncoming drivers.
An additional point when speaking about being DOT approved: Have you seen some of the garbage that comes on new cars these days? Straight from the factory they're blinding, even on low beam! And then there are those who think the cute little blue light is there to tell them that their headlights are on.