I agree with most of the points in this video. For me, if I was going rooftop it would be a wedge clamshell, but the cost just doesn't make any sense. The true benefit of of the RTT is that you have all of your bedding out of the cabin and pretty much packed away easily. It also really depends on your style of overlanding. It you tend to what I call Basecamp-Overlanding, where you set up a single camp for your trip and explore an area daily, the benefits of a RTT start to seriously be diminished, because of the constant pack up and set up each day. If you prefer to Trek-Overland (camping in a new spot each night), then having a quicker solution each day in an RTT may seem much more of a solution. However, as the video shows, there are quick setup tents that can be just as fast.
In my case, I use a quick deploying Coleman Tent, the Exped Duo mattress (I usually travel with the GF and I HIGHLY recommend this mattress), and a 2 person Sleeping bag. Where I tend to do 75% Basecamp, it is overall much easier to deploy and enjoy the trip. As we look to do more Treks, I could see us slightly modifying what we do, although it isn't too time consuming day to day.
Oddly enough having said this, we are looking to do a build together and we are eyeing either a pickup (Tacoma or Frontier) or a Bronco. In both cases, we decided that a clamshell wedge, integrated into either the truck cap or hardshell top, is the way we want to go. That would allow the easy deployment in either conditions and keep everything together.