Yea bonds are scary because convexity at these very low interest rates means their prices are extremely sensitive to changes in interest rates. The consensus is the Fed has complete control over interest rates due to their practically unlimited QE/QT firepower. However, the same Fed has also indicated they're willing to let things run hot for a while rather than fretting about quarterly inflation like they did for several of the past years as inflation failed to even reach their 2% target. Play with Excel a bit to understand the implications of a 1% rate change on trillions of dollars worth of treasuries with 10+ year durations. The Fed's choice is to either hit their inflation target or spark a financial crisis, so their "run hot" talk is empty chatter. We'll have a repeat of 2009-19, with barely-positive inflation, low rates, and possibly more rounds of QE/QT to keep inflation under 2%.
That doesn't mean a smooth ride. Treasury holders will still lose to inflation, and will fail to benefit much from another financial crisis. Long-duration holders will be severely damaged if inflation peeps even a little. We'll also have more taper tantrums and inflation panics that will rock equities, because everyone knows our vulnerability to inflation right now.
In such an environment, cash, rather than bonds, might be worth holding for its option value. I.e. cash gives one the option to buy low when the next correction hits, and that is worth paying the price of the maybe 1-1.5% spread between cash yields and likely future inflation (a spread that isn't much better for bonds). If the spread were any larger than that, you'd want to be in cash anyway!