I'm by far not the most read on the subject. There are others with much more extensive understanding then I.
But my rationale is as follows...
If I want to save today's earnings for a future spend. Say 10-20 years down the road.
As of the information we all have available to us today. Do I save in fiat or BTC?
True, nothing but death and taxes are a certainty.
But given the above proposition and the resources available to us today. I opted to go with BTC.
I also have fiat assets like my home. But having a savings account with a bank in today's environment...I can't justify it.