At a certain point, there may be a need for an investor to delve into something that is certain to provide a faster return, perhaps in a short period of time.
Why? Isn't bitcoin potentially volatile enough? What more "faster return" is necessary, and at what point would a person "need" to engage in such extra risk taking, when bitcoin is already risky?
No doubt bitcoin is potentially volatile with its own peculiar risk and returns but investing (diversifying) in other different projects that's not cryptocurrency is another form of expansion that returns made from there can be utilize into accumulating and increasing your bitcoin portfolio, in my opinion a good diversification can be a supportive ground for a bitcoin investor not to tamper with his bitcoin investment at any financial emergency storm that might hit.
If the money is there enough to diversify the risk factor shouldn't be an excuse not to diversify. None diversification of businesses is like driving a car on along journey without having a spare tire with you for flat tire emergency along the long.
You there is this saying that "the gap between you and your success is focus" Everyone wants results but nobody wants to stay focused. The gap between your current life and the life you want is called focus.
Focus 100% on one thing, instead of doing 5 things with 20% focus each.
In my opinion this is what @JayJuanGee is trying to say, for instance if someone accumulates Bitcoin with $10 per week and wish to diversify, since Bitcoin is volatile enough s/he can create another portfolio to invest another $10 per week and when price increases s/he can withdraw from their profit and still retain it's invested amount. With this example one can still remain in one business rather your speculation of diversity, then you can be 100% focused on one thing is stead of investing in 5 different things with 20% focus on each.