Curious to know how they compensate for windage? Elevation is easy to calculate, but at non-trivial ranges wind becomes a major factor in ballistics. Also: why

Curious to know how they compensate for windage? Elevation is easy to calculate, but at non-trivial ranges wind becomes a major factor in ballistics. Also: why are there not soldier-portable computer-guided sniper rifles? Deploy spotter + servo-driven rifle platform, dial in windage, designate target with laser or via screen, point, click, boom.