I know that for me, personally, I've hit a plateau because the lights do all I need and then some. The most favorite light I've ever owned is the BLF Q8 which has demonstrated the capability to do everything I have been able to ask from it. It has been great for around the house stuff all the way to some mild Search and Rescue for a lost dog in severe weather.
Now I'm more into aesthetics. For example I just wrote up a "real world review" on the Sigma light where there is absolutely nothing, NOTHING, special about the performance or behavior of the light, but the design is very very cool.