Well, any article that proposes to be a decision tree for whether to fix or ditch an appliance is bound to be limited by space and detail. Some of the information looks useful, but other info - such as a washer agitating in only one direction being solely due to a broken agitator - looks a bit dicey to me. And it ignores the various different methods of agitator removal, instead it says remove the cap, unscrew the bolt, and "voila!". Some good advice, though on electric dryers. Newer ones may require use of a four prong plug, and that can mean extra cost to have the outlet/wiring in the laundry area upgraded.
I wish, though, that instead of "ditch", they'd say, "donate the old appliance to a charity or put it on Craig's List".