Bonds may be more than just a safe haven.BondBloxx ETFs' Tony Kelly, a former Goldman Sachs Asset Management global ETF head, contends it's where investors can also play offense due to the market backdrop."It's definitely getting more nuanced," the firm's co-founder told CNBC's "ETF Edge" this week. "Advisors are being a bit more thoughtful because there is more opportunity in fixed income now that rates are no longer… close to zero [percent]."The Federal Reserve cut interest rates on Wednesday by a quarter ...