The "long tail" can be quite expensive to support and maintain. For a small shop, testing on all those old devices is probably not feasible without significantl

The "long tail" can be quite expensive to support and maintain. For a small shop, testing on all those old devices is probably not feasible without significantly affecting their overall velocity. For a large company like Amazon, hiring a few people to handle just that, full time, is a no-brainer. For Walmart and Apple, they have other business models to support their existence, so they do not see the point.