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Once again we have to ask "why is this even possible?" Web designers have been given too much control over the browser is the usual answer and seem to be the case here. There should be no interaction allowed between tabs.

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The problem is the implementation, not the feature.

The postMessage API provides a safer way for Windows/Tabs to communicate.

https://developer.mozilla.org/en-US/docs/Web/API/Window/post...

Given that most implementation are flawed, and given the limited utility of this "feature", and given the inherent desire to sandbox thing on a browser, I would say the problem is the mindset of the developers who keep adding stuff that ends up exploited.

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