What are the implications of placing your entire equity portfolio in iUnits, or some management companys index

Question:

What are the implications of placing your entire equity in iUnits, or some management company’s index mutual fund?
Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...