Like.
I think most linesmen do a brilliant job, but it really is IMPOSSIBLE for them to see two things, involving at least 3 players, at the same time, especially when all 3 of them might well be moving at speed, sometimes in opposite directions…all while they themselves are on the move!
That said, it REALLY pisses me off when they do finally out the flag up but don’t move back up the field where the event occurred! Sometimes, the free kick for the offside is 20-30 yards behind where it actually occurred!