here's a pop-sci whole thing about the feasibility of orbital based defense/offense https://www.youtube.com/watch?v=J_n1FZaKzF8 https://www.youtube.com/watch?v

here's a pop-sci whole thing about the feasibility of orbital based defense/offense https://www.youtube.com/watch?v=J_n1FZaKzF8 https://www.youtube.com/watch?v=J_n1FZaKzF8 tl:dr they're crazy expensive, impossible to aim, and you'd need lots of them to be the coverage of a ground based setup