Yup, everybody has their own goals. For us, back when we were buying I-bonds, it was more about each of us having bonds mature each year over a 10 year period. That goal was met with our last mutual gifts back in late October of last year, which is late enough in the year that when they mature we'll count it in the next year, if either of is still around or even cares at that point.Nothing certainly wrong with waiting until the end to get best calculation. In this case its a total no brainer to buy this cycle over next cycle in terms of maximizing the fixed component. With less than 2 months left there is no real way the fixed can reverse trajectory to beat the present 1.1%.
The Series EE Bond owners have just been abused the past several years. That present formula if any is just horrible. Back in the day, for several years it was 90% of the 5 year treasury. It is not within earshot of that today.
For me that is why I like a variety of income sources as accurately predicting interest rates is a hazardous occupation.
When some of my CDs mature I could find them to be paying under the current total IBond yield. That would not have been the case 6 months ago. That is also why I have long end income issues also. That can change week to week also and having recently purchased some is working well now.
One week the expert media hypes 10 year heading to 5%, a couple weeks later the discussion flips to if it breaks 4%. I try to ignore the noise and focus more on allocation size.
It may indeed be a no-brainer to some, and since we're done with our purchases it's moot anyway, but if I can get closer to near-certain knowledge by waiting a couple of months, I'll do that as my prognostication capabilities have time and time again shown to be flawed and the world has a way of not bending to my will anyway.
YMMV.Cheers