I personally do not like to use my rotary cutters with metal. I have, but it is with a blade I have marked with a Sharpie as to it's use. I mainly use metal tools for marking.
Over the years I have accquired numerous types of tools because of the different types of jobs I have taken on.
I believe strongly in taking good care of my tools.
With rotary blades, I start out cutting just good fabrics, as they become duller they are used for different purposes, like for paper or plastics.
I cut a lot of paperback book bindings off so I can coil-bind my own books. It irritates me when an instruction book won't lay flat on the table. I even do quilt mags.
I'm covering more than just your question but we quilters do an awful lot of different things. I would add... We are Women hear us Roar, but Billy might take offense :-D