While it may be hard to see in first world countries, imagine being in a third world country and having a place you can store value that can't be debased by your crackpot dictator. That's huge.
But, I think those big swings make it a poor instrument for most people to view it as a real way to store value.
You are missing the extremely important point that crypto is saturated by these types exactly and explicitly because of design decisions that are inherent in crypto!
The lack of transaction reversal is an explicit choice and explicitly empowers fraudulent activity over legitimate. What business or individual wants to lock up any value/cash/work they have in a system with zero recourse for fucking up?
Even if it wasn't for elaborate rug-pulls, you could still lose everything to an evil-maid with a $5 key logger. That is just untenable.