Is that 6 months total use and worn out?
Shocking really but given the little use most seem to see, I would think very few have seen 6 month holidaying in total.
No, it's six months of daily use. And it's rubbish.
If you look at the design of the fittings in most motorhomes, they are indeed fairly lightweight and won't last a lifetime, but they will last many, many years of use.
We use our motorhome for between three and four months each year. Had it nine years and no sign of things wearing out yet (so that's three or four years of full-time living). In fact many things are as good as new.
It is now over 21 years old, and some things have got old, such as the double-sided tape that holds the mirrors in place in the bathroom. I had to replace that. But that was just a couple of decades of ageing, not worn out through use.
The hob needed replacing recently, because it was corroding (water from the draining board was designed to run into it), and parts are relatively expensive. It was cheaper to replace the whole lot than three burners and three pan rests.
The motorhome I had before was still in fine fettle after 26 years last time I saw it, despite being a cheap, lightweight build that I'd not describe as a quality van.
Of course in the hands of a ham-fisted clumsy owner who doesn't look after things, a motorhome can be trashed fairly quickly.
There are some bits that do wear out faster than you'd expect.
Apparently, the electric heater elements in Truma combi heaters have a design life of 10,000 hours, and cost about £800 to replace (not sure why). Seemingly a lot of people use them over winter on hookup when the van is laid up, which only takes a few winters to clock up 10,000 hours.
Thetford fridges don't all have stainless steel fridge burners, so they won't last all that long. But they're generally fitted in cheaply-made motorhomes: Dometic are far better, but a bit more expensive.