Snowmonk there's something more private about using 3 tabs that didn't know about each other
Generally that's true, but if the accounts are already linked on Google's end then it doesn't matter. Have they all been paired in the same app before?
Other than that the only concern is whether you think the app can watch more than the browser, but I believe in GOS the sandbox hardening might also reduce that concern. Hopefully someone can correct that if I've misunderstood.