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Experts are sometimes wrong. That doesn't change the fact that they're right vastly more often than non-experts.

There is an important difference between "expert-sounding" and "expert".

Where memory leaks (or pretty much any performance metric) are involved, the more sure someone sounds, the less likely they are to be an expert unless they have done extensive measurements to back up their claims.

I could be wrong, but wasn't a large part of this due to Flash?

I think it turned out that a large part of it was due to, like, 100 different small things. There was never a memory leak.