[LAU] Basic question about use of a lowlatency kernel

[jonetsu at teksavvy.com]

If a better response time from the kernel is something that's Good, why 
isn't lowlatency kernels a default in Linux distros (well, at least in 
Linux Mint and Fedora)  If it is So Good, what are the arguments for not 
having a lowlatency kernel by default ?  Any drawbacks ?  I presume the 
Audio-oriented Linux distros do have lowlatency kernels by default, do 
they ?