This is no different than sitting on the sidelines trying to get into a stock at the perfect point or waiting on 'the inevitable sell off'. Maybe it happens, happy days. Maybe it doesn't, very sad days.
So... on the contrary. People have been selling TIPS and I-Bonds because inflation has come down from 9% to only 3%ish these days, so if you're buying inflation-based bonds, you're losing out significantly.
Cash today is worth 5.25% from a money market fund (aka: the overnight lending rate). 10Y Bonds are only 4.5% or something.
So "cash" (where "cash" means a money market fund, which is a generally accepted definition of "cash") is beating the 10Y and 30Y at the moment.
Scenario 1: Buy 10Y today, @4.5% interest.
Scenario 2: Hold that money as cash for 5 years, and then use it to buy 5Y when it's yielding 17% interest.
Scenario 2 will yield a greater ROI after the 10 years. Obviously, there's no way of knowing exactly what the future will hold (many other scenarios are also possible). It just all depends.
I hope I am wrong. I hope we won't see more interest rate hikes but wishes are not fishes.