Re: I have doubts
Did you read the article ? Its not designed for high data throughput, never claims to be. Its designed for low data volume sensors like temperature, water flow, light, distance, vibration that are sending a reading back once a minute. If you want to be sending high res video stream then these devices are not for you. However if you can process your video or images at the edge and send back the results of what you are looking for then there is potentially a use case for you.
Its interesting you mentioned hospitals and factories. Both of which are terrible for WiFi signal and hard to cable for power and network. To put a traditional AP on a plant floor could easily cost > $10k. Compare that to a device that costs < $200, has a 10-year battery, can be set in resin to be completely environment proof, has a magnet on the back for rapid deployment. You could flood an entire plant floor with zero maintenance mesh network for less than the cost of a single AP.
Going back to sensors, we are looking at a still image use case. There isn't enough bandwidth to send back the whole image but actually we can process the image at the sensor and send back a yes / no for what we are looking for. Problem we were hitting was the power used to do image processing was dropping battery life from 10 years to a few months. Solution was a rechargeable battery charging using a PV panel that worked from a nearby florescent light. Also as the solution is two way we can update the image processing code and send firmware updates though these can take days to get there.
The issue over standards is still a pain but hopefully that should work itself out in the next couple of years.