Apparently you are making this judgement even though you have never owned, touched, or used the Lee FCD. I have on the other hand been using them for 35 or more years. Here is a video that is from 2015 so it mentions earlier Lee FCD's that do not have any carbide sizing ring. Also the one he calls "rifle" on the left in many of these videos is now being offered by Lee in many handgun calibers.
https://youtu.be/YWnw0sTBO8w
You need to understand reloading is not done if any of the brass is different length. Any brass that is different length needs to be trimmed to length prior to reloading.