This is it entirely. I don't really care if the pessimists or optimists or somewhere in between ends up being correct. What possible reason is there to change the rules around the indexes unless these companies and their backers know that time in the market is going to expose that they're overvalued and they want to force someone else to be holding the bag when that happens.
Is it possible SpaceX is not massively overvalued and delaying its index approval unnecessarily slows its economic output by needlessly restricting its access to funding, harming us all collectively?
