Turns out people (and institutions like municipalities and pension funds) sometimes buy index funds before SpaceX enters the NASDAQ 100, and changing their policies over a single event would be a great effort and expense, and set a bad precedent. Sounds crazy, but it's true.

Nobody has any idea what point you're trying to make, and the fact that you're repeating yourself and not being clearer makes everyone suspect that you don't have any idea either.

A lot of employer pensions will have limited fund options. (At least in the UK, maybe the US works differently.)

Quite likely that the only sensible one for most people (~global equities) will track S&P 500 internally. So essentially employees are being forced to hold whatever the index includes.

Hopefully it's less of a problem with Nasdaq, but it was a real worry.

It's not NASDAQ as a whole... it's NASDAQ 100.

https://etfdb.com/index/nasdaq-100-index/ are the ETFs that track that index.