Absolutely nothing. If you want to rebalance the coins every day according to their market capitalisation. Or watch over them 24/7/365 in case of market or project melt down to defend the price of your funds. Given that all of that will be taken care of and all you have to do is hold one token that automatically manages risk through selecting only the most prominent and successful of projects at any 1 time, and the price of the underlying assets is the price that the token is worth, then no, there is absolutely nothing stopping you doing it for a saving of 0.25% a month on a fund that returned 930% in its first 11 months.

Alternatively, you can have all that done for you in one easy holding for next to nothing against the potential returns.