I hate carpet but IMO masters can be different in many ways from the rest of the house so I don’t see a reason why not.

Three patterned carpets, one house. NOPE. Not even three colors, solid! Unless you do favor "choppy"

For those who like changes between rooms ( rugs) between rooms? You need the unifying aspect of hardwood BENEATH those rugs. Just one reason why hardwood flooring is fabulous. Yes, EVEN on a second floor. No your toes won't be cold : )

I agree but there is carpet now and hardwoods would b too expensive.

Then repeat something you already have in the house, or match the rest to what you want in the master. You asked: )