"All this is driven by corporate funds, sovereign funds and even VC funds with capital pools of tens of billions of dollars dwarfing any of the dollars in the first Dot Com bubble – and all looking for the next Tesla, Uber, Airbnb, or Alibaba."
Yes, but this is the other reality of today, from Calculated Risk:
"CR Note: Currently the target range for the federal funds rate is 1.75% to 2%. With inflation running close to 2% by most measures, the real Fed Funds rate is still negative."
In other words, investors still can't find enough investment opportunities that they find attractive, so they are still willing to give huge amounts of money to the government for free. Some of this can possibly be attributed to the Great Stagnation, the slowdown in innovation, growth, productivity and technology which began in 1973. Some of this can certainly be attributed to rising pools of savings all over the world. But it remains a fact that there are not enough software startups (nor enough manufacturing startups, nor enough legal startups, nor enough medical startups, nor enough of any kind of startup) to absorb enough capital to bring the world's capital markets back to "normal", if we can agree that "normal" means most investors expect to make at least a small profit on their investments, including their bond investments.