Yeah, but we gotta snap into reality that the world still remains dominated by fiat, no?

It could be possible that you do not understand the concept of "keeping some dry powder", no?

It seems to be a bit too lopsided to have 100% invested in bitcoin, and maybe you do not mean that?  It also would seem to be a bit imprudent to not have any fiat-related investments, no?  Maybe that depends on age, but I would argue that even if you feel that you are really young and have not really had time to build diversification in your investments, it still may be prudent to hedge a little bit - because we know that bitcoin prices have been volatile and bitcoin prices are likely to continue to be volatile.  

It surely seems that bitcoin will become a bit less volatile as the market cap goes up, but the fact of the matter remains that the price of this asset class (aka bitcoin) can be manipulated with a relatively small amount of capital - give us another 100x in price appreciation (and increase in market cap), then it will become a lot harder (relatively) to manipulate - and volatility will decrease.

In my case, I currently have a fund dedicated to bitcoin investment, and sure I would like to be at 100% in that fund, especially when the prices are going up, but I would get a bit stressed out if I were 100% in that fund because when the price starts going down, the roller coaster can be a bit much to bear, because you can never really be sure about how long and how far the price is going to go down, and therefore within my bitcoin investment fund, I am currently about 93% in bitcoin and 7% in fiat.....

I also have to tweak my bitcoin investment fund from time to time here and there to continue to feel comfortable.. while attempting to keep some "dry powder," as they say, just in case we get a decent price drop.   I even buy with price drops as small as 3%, but then if the price drops 35%, which it recently did - remember mid January?, then it is much more comfortable to have some ability to buy some BTC back with already allocated bitcoin funds and not having to scramble to come up with funds at the last minute.