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This reminds of peanut allergies. Did older cameras not have light leaks, or were consumers just not hyper-obsessive about finding them?
I assume you're not actually familiar with peanut allergies then... considering peanuts are responsible for more food-allergy deaths in the U.S. than all other food-allergy deaths combined.
As a society we might be grossly over-stating, and treating, the number of folks with allergies, ADHD, gluten intolerance, and a host of things, but it's just as foolish to pretend that the serious forms of these pathologies are the result of obsessive searching behavior.
People who die as a result of eating/inhaling a part of a peanut are not making it up.
A better analogy are wear-and-tear pathologies, like in joints: If you scan the general population you'll find tons of pathological findings in totally non-symptomatic people. For many of these findings you don't have to do anything; treat the symptomatic cases or the cases where empirical findings suggest early treatment has better outcomes than waiting and watching. There's a reason why full-body MRI isn't part of an annual check-up for healthy people... and it's not just the cost/time involved.
Sorry to go so far off topic, but I think it's a canard in popular society to push back so hard against the rise in allergies/auto-immune conditions that we start repeating that they're simply a result of "hyper-obsessive" searching behavior.
The whole issue surrounding peanuts in public places isn't about the folks who think they're allergic (and perhaps are not allergic), or for whom a peanut or two in food will cause minor discomfort-- it's for the kids who die when they're exposed.
As for the light leaks, I agree that it's just not a big issue if it doesn't impact your shooting. A little tape if you must. At the same time-- it's unfortunate to pay thousands of dollars on a camera that you find out has this problem when you're out shooting that long-exposure night scene with light hitting the gap in just the right spot.