A bath was a requirement when I was camper shopping. I'd camped under the cap on a pickup for a while and found there were far too many times where using my outdoor portable shower was just not an option and, for me at least, a sponge bath just didn't quite cut it after a hot day in the outdoors where regular application of bug spray on any exposed skin was a requirement. I'm also a big dude (6'2" 230 lbs) and I usually step into the shower for an initial rinse, step out so I have the space to lather up, then step back in for the rinse off. As long as the weather outside is mild, the outdoor shower/toilet is fine. But the times when you need to bundle up to go outdoors, either due to temperature or precipitation, is when the indoor facilities are worth the weight/cost. IMHO.