Should i give my dishwasher and refrigerator their own supply lines?

I am an owner builder and I am currently working on plumbing for my house. I have taken a class at a community college so I kinda know what I am doing but I have run into a dilemma. What I have read in my Stanley Plumbing book is that I do not need to give my refrigerator or my dishwasher their own water supply lines but rather can branch off the sink supply lines assuming I am only installing one sink, dishwasher and refrigerator in the kitchen (which I am). My question is: "Is that the best way to go?" I am worried that this may result in low water pressure in my sink when either the ice maker or the dishwasher is running. Also the fridge will probably have its own water dispenser too and i my book said nothing about fridges with water dispensers. Insight from experienced plumbers or people who have installed new kitchens will be appreciated. Thank you!