I view i bonds as forced savings and retirement $$ ... I max out everything, 401K, HSA, and even do my employers ESPP which has a -15% discount at time of purchase. For the past 5 years I've been allocating to i Bonds on 1/1 of the new year. Not everything in life is about squeezing out the last 100bps ... at least for me anyhow.
VM!