[LAU] Run all audio through Jack?

[Jonathan E. Brickman]

I'm on Debian testing nicely tweaked (a.k.a. AVLinux), which means all 
sound is pure direct ALSA, except when I turn on Jack and run something 
explicitly through it.  The question is:  Is there any reason why I 
should not be running all audio through Jack?  I heard that through 
.asoundrc one can achieve this quite easily, and it strikes me as a way 
to speed up the process of setup for a gig, unless there are downsides I 
don't understand? 

J.E.B.