I agree, if they are all going to look alike, work alike and the base is now Chrome, then might as well use Chrome. But frankly if I wanted to use Chrome then I'd be using Chrome now.
I've stopped the version madness here, I have some plugins that I love that preclude me from going forward. I'd rather see the team go "Hey we have 2.3 million person years of backlogged bugs, we are going to fix them before we make a fundamental change to the browser.
Security is an issue, but with my work machine I'm not hitting sites that would put me at risk.