Sure, there might be a slight benefit of having stocks vs a bonds in a Roth, but it shouldn't be much of an issue. If that is your preferred allocation anyhow, I wouldn't worry about it. Personally, I feel bonds in any retirement account is a waste since I'd rather get the growth of stocks in my tax-advantaged accounts. The only bonds I own are muni bonds in my emergency fund.
What is your tax bracket? Does a Roth 401k even make sense for you?
