You don't have to choose whether you want to have an actively managed, or a static portfolio: you can have all of them at the same time.
The idea of the meta-portfolio (which is basically, a portfolio of portfolios) is to diversify between different approaches of portfolio construction, not only between asset classes. Diversifying between approaches can have same effect as diversifying between asset classes themselves.
And there are tons of other opportunities that I don't know much about...
When deciding about how much to allocate to different approaches, it's useful to take the strategy's volatility into account. Read more about volatility targeting here. Usually, you want to allocate less to a more volatile strategy, so it won't end up dominating your portfolio's returns & volatility.