Because people use Linux at work too. (Score 2, Informative)

I care about performance because I have a few hundred thousand files on servers that 100 employees need to access. Caching will only get you so far when you have a lot of people going after a lot of files through out the day. Since we have the choice of which fs to use, it is nice to have more info to pick between them.

There is more to this world than home users and databases.