why generic-pae kernel on Lubuntu?

As Summary,
why generic-pae kernel on Lubuntu?

I mean, in http://lubuntu.net/about i read this:
"Please join us and contribute creating a lighter, less resource hungry and more energy-efficient Linux Desktop."
and in http://en.wikipedia.org/wiki/Physical_Address_Extension :
"In computing, Physical Address Extension (PAE) is a feature to allow x86 processors to access a physical address space ... larger than 4 gigabytes."

I think: the key word is "less resource hungry".
So, i think also, the largest percentage of Lubuntu's users, install it on computers with less than 4GB of ram.
For example the olds pentium 4 motherboards cannot have more of 4 GB ram.

Thanks everybody.