Full disclosure , I own a floor less shelter manufacturer but I try to be objective in my discussions. We have both options when adding a nest but I rarely use a nest (which is a fully enclosed inner tent). I use a nest in real dirty country ( sand sometimes ) when I expect snakes ( maybe in the desert) and to keep my dogs of my gear ( only sometimes and if I have the whole pack). For high country outings I go floor less all the time to save weight and so I don't have to worry about having shoes on dirt etc. Floorless is just much simpler and lighter. I find a ground sheet pretty much does the trick with wet ground but honestly I rarely use those either. I simply pitch the tent and thrown down my sleep gear and call it good. I often cook in my tent , I don't worry about spilled water or even if my shoes are on or off. The nests ( inner tents ) are fine, and sometimes I use them, but in the last year I would put that at 2 or 3 times. In fact the last two desert trips I did were Floorless and sleeping under the stars if weather was good. Overall and this is my opinion, outside of weight savings I really like the simplicity. Floors are not a fix all, they are prone to holes, limit where you can pitch a tent, can leak water in a port selected location, will pool water if you spill something , and often accumulate dirt and bugs anyway. Floorless is generally easier and more hassle free.'