Imagine heading to your Applications directory, selecting all, and pressing CMD+O to open them all. Even if you're a typical user, and your apps are mostly just run-of-the-mill light Cocoa apps, having 50 running concurrently will take its toll on the system.
Chrome's tabs are each running in their own process, it's very similar to running 50 copies of the same app. Modern websites are hefty even for just one tab (this is why Safari on iOS struggles to keep more than a few tabs in memory at a time).
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Imagine heading to your Applications directory, selecting all, and pressing CMD+O to open them all. Even if you're a typical user, and your apps are mostly just run-of-the-mill light Cocoa apps, having 50 running concurrently will take its toll on the system.
Chrome's tabs are each running in their own process, it's very similar to running 50 copies of the same app. Modern websites are hefty even for just one tab (this is why Safari on iOS struggles to keep more than a few tabs in memory at a time).