You raise some good arguments and I welcome a little push back.

The Boglehead philosophy is very long-term. I'm a bit older and began investing 28 years ago and learned many lessons the hard way through the tech bubble, Great Recession, longest bull run in history, and the current economic state that we're in that may be or become a Recession again or perhaps not.

This philosophy urges you to basically ignore all the current trends and Dollar Cost Average (DCA), purchasing more shares when the prices are low and fewer when they are high.

It is simply a philosophy and appeals to people with less time and inclination to closely study trends.

That said, I did purchase an I-bond last year when the yield was around 9% and recently purchased an 11-month CD which I recently wrote about in the Making of a Millionaire publication which is getting thousands of reads.

This is a long answer, but the short of it is to diversify and invest whichever way makes you feel most comfortable, although I do strongly advocate for a "rainy day" fund in something safe like a CD or high yield savings account like you mentioned.

Also, kudos to you for getting into investing and I applaud you for reading personal finance stories and making thoughtful comments.

Thanks again and I wish you well Brian.