Goal line tech is fact based. When it came in I said on this very forum that it would usher in all sorts of fancy do dahs and I was shouted down by the likes of you and Andrew and the rest of the IT crowd type geeks who also have some unfathomable interest in football. Time was you lot would be sat in your bedrooms fuckin terrified of the footy lads but you're getting your own back by hooking your fuckin fancy zx spectrums and Commodores up to the match to spoil it for it for every normal fucker out there
Offside should be fact based but there's ample evidence to suggest it's still down to an individual's interpretation of the very wooly offside laws.
See also my reply to @RobinRobin
All joking aside, if VAR is here to stay the rules of the game WILL have to change because of it, so it will work properly, quickly and with the crowd in the stadium kept fully informed.