I think target dates are fine if you don’t want to think about investing. Otherwise there are two camps, one camp thinks it’s stupid to own anything other than S&P 500/US stocks because of American exceptionalism and 15 years of strong outperformance of this strategy. The other camp, which I’m in, looks at long run history and thinks that a diversified portfolio resulted in a superior risk-adjusted outcome, and thinks US stocks will not do as well over the next 15 years as the past 15 based on starting point valuation. Choose your camp.
Re bonds specifically, they are great if you use them right. It seemed silly pre-Covid that you were getting paid 4%-5% yield to loan money for 5-10 years for risky companies, and ~2% to the government. Now you can make 7% loaning to risky companies and 4.3% to the government. It doesn’t feel as silly. 4.5% on the US 10 year feels about right so +/- fair value. Corporate bonds look overvalued but so do stocks so your pick.