If you mean they are not bright enough, they will never be like headlights, they are designed as fog lights, not intended to put the light way down the road, intended to be more of a low flood light. If you ever saw an old true sealed beam fog light it had a very sharp cutoff so that no light was directed upward and a very wide pattern. I had our shop install rear deck warning lights years ago and they used fog light sealed bulbs, they were terrible, you had to be laying on the pavement to see much light from them at all.
The whole point of fog lights is to put light down low and not illuminate the "upper fog". If you illuminate the upper fog it reflects back into your eyes and makes it harder to see instead of better. I would expect super bright fogs to have a similar effect of too much back-scattered light that just makes things worse instead of better. A lot of people, myself included, kinda of like the look with them on and most of the use of them isn't for fog at all. I did run into actual fog on one trip and the factory fogs seemed to work as intended and kept the illumination down low.