They do have cutting edge variations, such as Oregon cob. They also have old fashioned variations, that still exist and are used. And some of the cutting edge i

They do have cutting edge variations, such as Oregon cob. They also have old fashioned variations, that still exist and are used. And some of the cutting edge is old enough to feel a bit rusty. (Superadobe was invented before people knew about the problems of microplastics, for example.)