SLAM and localization in general are early bottlenecks in mobile robotics solution, unless the core business of the product is localization itself (e.g. waymo, cruise, etc.) it's not uncommon for that to take a back seat during product development later on. In my experience lidar based solutions are more common out there due to their "simplicity" and safety for industrial applications (i.e. PL-rated)

You certainly can work with visual slam in the industry, but the job pool for that is not very big, I would say.