The float will get bigger as you wait tho, since it's common for early investors to be locked for e.g. 6 months. You can argue it's better to smooth the entry as float gets unlocked rather than being front run by all the hedge funds in a single day on a massive capitalization.
The lockup periods are also being fiddled with: https://finance.yahoo.com/markets/stocks/articles/spacex-ipo...