Some worry that one day sooner than later a plethora of jobs could be taken away, from real humans and given to robots and computers that could presumably do the work faster, cheaper, et cetera.
Another plus that I really liked is that this was developed as a close collaboration with a top tier eye hospital in London to make sure that the results are as practical as possible.
The advantage of intercepting sunlight in space, instead of letting it find its own way through the atmosphere, is that so much gets absorbed by the air.