True. All I'm saying is that the amount of effort needed should be taken into account when judging plausibility. At some point even with wizarding magic to help, the amount of effort and competence needed because difficult to sewallow - though what that point is will obviously vary.
There's always going to help a certain amount of suspension of disbelief required, things brushed under the carpet, but you can move the problem area around, or spread it out more thinly. You just can't eliminate it completely.
My preference is that wizards had a low impact on muggle history, which is implausible without further explanation, making the cover up relatively simple. It's also quite possible that they had a massive impact, which needs a significant continuing effort to keep it concealed. Both options are valid, as are all the points on the spectrum in between.
There's always going to help a certain amount of suspension of disbelief required, things brushed under the carpet, but you can move the problem area around, or spread it out more thinly. You just can't eliminate it completely.
My preference is that wizards had a low impact on muggle history, which is implausible without further explanation, making the cover up relatively simple. It's also quite possible that they had a massive impact, which needs a significant continuing effort to keep it concealed. Both options are valid, as are all the points on the spectrum in between.