Why calendar synch?

I use Sai Suke Lite as my calendar app. I can apparently synch it to Google calendar. My question is: why would I want to?
When I synch my Touch, it saves my Sai Suke data, right? So if my Touch crashes I can restore the data later. Why do I need/want a desktop calendar at all? I've done without one for years. Am I missing something important?
I know I could access my Google calendar from any computer, but with my Touch in my pocket, that's redundant.