Security. If the people are holding all the tokens, there is no reason for the sections to be attacked.
Also, if you finish all monetary inflation quickly, the whole system will theoretically stabilize faster (bitcoin reached 20k at 3.9% monetary inflation). Now people think that this will f#ck up the first investors, because few people understand that it is not inflation that matters, but the ratio between new people and the inflation.
If millions and millions of new people enter the game, the price will rise, despite the fact that monetary inflation is high too. See my explanation for The 112 Club: