Q: Why can't I use/provide multiple IOS devices simultaneously from a MacOS machine?

A: This is a technical limitation within the video streaming mechanism. It is being investigated.

Q: Can I use this without a paid Apple developer account?

A: No

Q: When I try to click on system dialog boxes, it seems to always select "Cancel" or just close the box.

A: Yeah. This is a defect with how WebDriverAgent works. I doubt it can be fixed without ceasing using of WebDriverAgent for clicking.

Q: Clicking is really slow.

A: This is because Apple doesn't provide any reasonably effective method for simulating clicks that is documented. This is being investigated anyway and there will be a solution within a month or two.

Q: Do I need a machine running MacOS to use this?

A: Right now, yes. In the future, once additional research and reverse engineering is done, no.