How can you be baffled about one decision being talked about because its technically correct, but be annoyed about a different one that's technically correct?
In each case, I think you can accept that the technically correct decision is right, but doesn't necessarily feel right to everyone. Hence discussions about how each could be improved. I think the automation of VAR is a big step towards it feeling fairer, but it still doesn't feel right to me that a player who is "basically level" is penalised. Nor does it feel right that a defender a long way from goal, with an arm out for balance, with a ball blasted from not far away, gets punished with a 75%+ chance of conceding a goal.
Without VAR, Foden's goal last night would somehow have been allowed, which probably becomes Slovakia's "Lampard v Germany" moment, so in that way it improves the game. Far from perfect though, and one way or another the game and rules will adapt to its useage.