It literally takes me 2 seconds to plug in my N900, select 'pc mode' and click 'connect' in Ovi Suite in windows to tether it over usb. It's so ridiculously easy and fast that I can do it quickly if I'm on the road and have to look up something for work while a client is waiting for me. The last thing I would want to do is muck around with the linux commandline when a customer is waiting. That's just embarrassing.