I just want to point out that more people looking into Electrum is good under the original context of the quote. bob123 was basically saying that plenty of people with the technological know-how have already reviewed its code considering its popularity, meaning you don't necessarily have to review it yourself, and that you need to trust the developer less. I'm not saying that popularity doesn't have its downsides, but it's one of the reasons why Electrum is generally considered trustworthy.