"Right but why would VCs want this? Wouldn't VCs value the liquidity of being able to flexibly enter and exit positions? I really wish there were a simple explanation of why companies don't want to IPO as early as they used to but there isn't."

To me it's pretty clear. The earlier investors take out all the possible upside and then dump it on the retail market. The retail investor will be less and less able to buy stock that will grow 10x and more. It's hard to imagine SpaceX, OpenAI or Anthropic will multiply in value after the IPO. They are priced in a way that they have to execute perfectly for a long time to justify even their current price.

Just another step for the super wealthy to keep profits for themselves instead of letting the broader population to benefit.