That is not true at all. Milo and its little brethren have been used for many years, in place and with the actors. In case you missed the notes about it, these systems come with detection, fail-safes, and kill switches to prevent issues. And -always- have a human operator in final control of them.

See, for example: http://www.mrmoco.com/images/rigs/talos/img5-fullsize.jpg