Plurality is a similar point system with the peculiar rule that a voter may only give a point to 1 candidate. Approval is Plurality done right. Plurality with the voter freedom that it should have had all along. Maybe in principle, voters in Plurality all vote for their favorite. Realistically, we all know that isn't what happens.
Many people vote for a compromise instead.
If I vote for my favorite, and my 2nd best, B, and B beats C because of my vote for B, the C voters have nothing to complain about. If they object that I had too much power because I voted for 2 candidates, they can be reminded that Approval only lets me give 1 vote to any candidate. I'm one of those voters. That's the only needed change. No new balloting equipment or software needed.