Why is kernel optimized for size?

[Steve Snyder]

I notice that the Fedora kernels have the optimize-for-size option 
enabled.  Why is this?  

The Fedora developers seem not to expect their kernels to be run on 
low-memory systems, given that the 4GB memory map is also enabled.

Is there some benefit that -Os confers over -O2 beyond the sligh savings 
in system memory use?

Thanks.