People have listed the pros and cons rather completely and I agree with most of them. Here is my story and it has more to do with aging and the change of outlook than it has to do with pop ups being either good or bad.
While in our 20's we tent camped and did a lot of it. Never into backpacking so we camped out of the trunk of a car or the bed of a pickup. When we were in our 30's we had two daughters and continued to tent camp but found it increasingly difficult to pack all the stuff we needed so we got a Starcraft tent trailer of the late 70's vintage. Loved this thing and used it heavily for 17 years. By now we were getting into our 50's and were starting to do some "traveling" which required us to move the pop up a lot. We also were getting into late fall trips as well as early spring fishing trips. The idea of a full fridge and furnace made sense so we jumped into a hybrid. Traveling with one of these is marginally better and the constant set up and tear down started to wear on me. Getting caught in the rain while on a road trip was also an issue so by the time we hit our late 50's the hard sided trailer made more sense.
So, our ages and the change in our expectations brought us to the trailer we now have. We have gained a lot in making this change but we have lost a lot as well. I still wish I had my tent trailer parked beside the garage. I would still use it on some fishing trips. But, you can't keep everything so decisions have to be made. We went with what was best for us at the time and chose not to look back. There is no perfect RV. Once you accept that, it makes things a little better. What we have now works for us and we are happy.We also do not condemn others for their choices. If they want to sleep on the hard ground, good for them. If they want to pull one of the huge 5ers that block out the sun, then I am happy for them. To each their own.