It's not a matter of learning something new or different. Windows 8 is cumbersome to use if you don't have a touchscreen computer. That's my complaint against it.
No, sometimes you just need to get the job done, and relearning something just messes with your productivity. Give me the option to do it the old way and the new.
If software companies built cars, we would all have to relearn how to drive every 3 years...
