Only about 1 in 20 of full-timers we meet have a washer/dryer in their rig.
Most common reason not to have them is space. We certainly don't have room for them in our rig.
However, my wife does look fondly at the option of adding a w/d combo or two separate units - whenever we are looking at other rigs.
So, I've taken the hint. Our next rig will have a laundry capability is at all possible.
As mentioned above - it takes a change in mindset to adjust to a once a week, once every two weeks laundry schedule.
Having spent 20+ years in the US Navy, I've always made sure I have one or two weeks of clothes / underwear / socks on hand. My wife on the other hand, seems to be comfortable with three sets of underwear and four pairs of socks. She would do laundry every day or every other day if she could.
But she is learning the freedom that doing laundry once every 10-14 days brings. She realizes that she spends a lot less time on laundry by doing one big wash every couple weeks than a little every day or two.
But she's an old woman, and if she has the option of a w/d - she would take it. Old folks are reluctant to change things. :D