Frankly ... I don't see it. The Summit has a shooting rail which is about the most stable shooting position short of a bench & sandbags. It's infinitely safer, HAS to be more comfortable with a solid backrest and big foot platform, faster & easier up & down and a far more stable shooting position for all 360°. I still do the lineman's belt routine putting up 35' high hang-ons and I have no issue with hanging from, and trusting ropes; but the saddle doesn't strike me as being anything more than "fun" for those who like a little adventure now and then. "Maybe" in super special situations it might be better than other available options.
That's because you have never used one before. And to be honest, neither have I. So I can only look at it from the same prospective as you. Which has always been similar to your views.
But the fact is dang near every person that I have ever conversed with that uses a saddle, and have hunted both ways, have told me that given all the advantages (in their experiences) of saddle hunting over using a climbing stand that they would never go back to a climber or hanging stand. Most that I know that use them are in their 60s.
My BIL law is one of them. He claims they are far safer and more advantageous than a climbing or loc-on stand. Everything from weight and packing ease, to increasing the availability of trees that you can utilize in any given area, to 360 degree concealment behind the trunk on approaching or moving animals from ANY direction. He also tells me that he sleeps in his saddle all the time, he just hangs up his crossbow and relaxes hanging there like a sack of potatoes. He loves them.
But like I said, I have never taken the time to use one either. If I had of, from what I have gathered from the folks that do use them. I would probably wished I had started using one a long time ago. But having never been there, my climbers and loc-ons have always served me well.
With that said, I am well aware of their shortcomings that the saddle guys seem to not have to deal with. I can't shoot 360 degrees out of my climber. I tried shooting around the tree one time and ended up hanging by my safety harness! I ain't doing that again!!