Totally agree with you on the offside thing it is a complete load of bollocks. They are trying to do offside calls to millimetres when there is loads of margin for error in the tools they are using. How do they know which freeze frame to select, what frame rate is the camera, motion blur in the image etc etc. It is absolute lunacy how they are implementing offsides.The biggest issue with VAR is the attempt to freeze time to gauge offsides. When does a player make a pass: is it the moment the foot touches the ball or the moment the ball leaves the foot? They're effectively trying to freeze a continuous motion to make a binary decision and that's almost impossible.
The other thing they need to sort out is the slow motion replays. Yes, there might have been 'contact' but the question should be whether it's sufficient to result in a foul. The Dani Ceballos penalty decision on Friday showed everything that's wrong with the current application: minimal contact given as a penalty and not overturned by VAR but play brought back for a fractional offside three passes before.
The thing is though there are simple solutions to sort VAR out but they are too pig headed to sort it. Offsides for example, make the lines twice as thick then if they are touching then it is onside. Give some margin for error and more favour to the attacking team. As I say it's not the tech it's the clowns using it.