Of course if I only kept two coffee makers my wife would want to know who I am and where's her husband? Right now, I have three HX's, four Gaggia's, a dozen of so vac pots, one Aeropress, three press pots, three drip machines, and a few cone pour overs. Then there's a collection of moka pots (stove top & electric) and a few lever machines, plus I'm sure there are more somewhere hidden away.
So the reference to only having two machines was a hypothetical situation, not one I'd advocate in real life. I use different brewing methods for different drinks; for instance, for NO's style cafe au lait I use a Bialetti Venus. But day in & day out, I'll stick by my two favorites - vac pot & espresso machine.