I have an1100 mill, 24r router and a 8l lathe. They all require setting x,y,z after startup or shut down. In very simple terms there is no stepper driven machine that I know of on planet earth that does not require this for accuracy. If you want to avoid that one very simple step then you need servo driven machines that retain position.
I must say that every time I purchased one of these machines I had people line up and tell me how bad they are, how they are not accurate and how you have to do this or that like set x,y,z and how they would never buy one. 
Well I’m glad to report back after extensive experience with over 10k plus hours using these machines that this is no big deal and takes a couple minutes to do and then you can run for hours making parts.
There are hundreds of steps to follow to create accurate cnc parts and setting x,y,z is just one of those steps. I spend far more time prepping materials, fixture design and CAD/CAM then the couple minutes at the machine setting x,y,z. In short you are stepping over a ten dollar bill to pick up a dime.
IMHO of course