Building glue is not magical and it's widely used, at least in western Europe. Glue is rapidly replacing mortar (just not for foundation and facade stone). Also

Building glue is not magical and it's widely used, at least in western Europe. Glue is rapidly replacing mortar (just not for foundation and facade stone). Also, it dries a lot quicker than 45 minutes. A builder doesn't have to wait at all to add additional layers. And at the end of the workday, you just drop you glue gun, no need for lengthy cleanup of everything used to make mortar.