Actually, there are other cameras which can take such long autoexposures, the Nikon FE being the most obvious example.
The unique thing about the LX is that it is measuring the light in real time, i.e., during the entire exposure.
Pentax only specifies 125 seconds, but in reality it will go until the meter determines that exposure is correct.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.