It all depends on what you want and are able to do physically, the route, and what you can afford personally.
Most people can not afford to hotel it every night that a WarmShowers is not available or they are not able to do the required distance. Sometimes, even if you could afford a hotel every night, there just are not any available.
I am fortunate enough to be able to get a hotel when I want one. Some of my tours are strictly hotel only. Others are camping only. Most are a mix. For me personally, it usually boils down to route. For me, the camping gear offers a lot of flexibility for only about 6-8 additional pounds or less (assuming you have good, lightweight gear) for the tent, sleeping bag, and sleeping pad.
That said, you said you are obsessing about 20#. My wife of 31 years pointed out that I could lose 20# of body fat (she put it nicer) and I would be healthier and it would not cost anything. At first I blew that off until one day I lugged a 12# watermelon and am extra gallon of water (8#) to camp. I was amazed how difficult it was with the 20 extra pounds. That experience made me want to lose the weight. However, it was the onset of diabetes that really kicked me into high gear and I have lost 25# to date. I climb better, feel better, etc.
As a friend says, brings what makes you smile. In other words, if the extra work required to bring the stuff that makes you smile starts to take away the smile, re-evaluate what you bring. Otherwise, don't obsess.
Tailwinds, John