But offside is different - you're either offside or you're not. Handball can be subjective and if a hand means a goal is scored then sure, bring it back. But offside is like goal line technology - it's a yes or no decision.
You're missing the point - as does VAR. Sadly for football in England.
If the on-field referee gives a decision on something that's millimetres either way, he's made a decision; stick with it. Under a microscope it might (or might not) be a clear and obvious offside, but it is not a clear and obvious error - and that was always VAR's remit, to spot clear and obvious errors, not marginal offsides which weren't clear and obvious.
If the error cannot be seen in real time by the naked eye, it is by definition not clear and obvious.