All good points I learned and used a Thompson A for twenty years then bought a Renzetti. I use the rotary for checking the far side of the fly. On occasion I will use the rotary for wrapping floss, That's about it. I also have two Regal's that I bought at very good prices and I use one of them when on the road.
As stated when teaching a class I encourage the students to not use the rotary so the will get the basic's.
We have a fellow in our TU Chapter that is a rotary man. He wraps everything with it and when I watch him it seems that he adds more steps then is necessary.