Yeah, there will always be 1 mm offside outcomes, don't have a problem with that and dont think there should be any discretion applied, just where the binary line is drawn.
Rules/laws can be modified. My view is that incidents such as this shouldn't be offside. It's nothing to do with preventing the greatest comeback ever, or goals that we have scored that have been ruled offside. I think the laws should be changed to reflect the fact that we now have VAR.
It may be a technically correct decision. The issue, at least for me, is should this be the correct decision, i.e. should the current law/interpretation change so this wouldn't be technically offside? I think it should.