You go learn why. Learn about the cost of volatility.
"Volatility" (and whether it's favourable or adverse to investors) is a relative thing.
If I'm holding bitcoin as a store of value and it protects me against the collapse of a fiat currency, than that qualifies as "volatility", but I'm on the right side of that volatility by having identified the appropriate monetary priority according to my needs.
If, on the other hand, I'm a motor car manufacturer and have a 6 month time to market, then I need to be on the other side of that "volatility" equation in order to make sure that my revenues are measured in the same units as my budget and I am able to escape the equation with a positive margin.
This is the conflict I was explaining earlier between a currency and a store of value and why if you try to be both you'll end up with a "crap crypto".
Conclusion: Currencies (unit of measure) and Stores of Value are not in conflict as long as you decouple them. They are complimentary. One is needed for commercial operations so the projects don't go bust (due to adverse effects of volatility), the other is needed for storing value BETWEEN commercial operations (accrued from
beneficial effects of volatility).
Learn why Germany's industry wanted the Euro to eliminate exchange rate risk for their European markets (and how that enslaved the PIIGS who borrowed in Euros but couldn't pay it back in devalued currency)
Actually, the Euro was as much an initiative of France as any. Valery Giscard D'Estang proposed it to Germany in 1964 precisely because France was suffering from the adverse "coupling" that I've been describing between stores of value and units of measure.
At that time the post war Western world was operating under the Bretton woods system where currencies were tied to Gold regardless of whether any country had a trade surplus or deficit. This meant that national currencies were conflicted between operating as a unit of measure and store of value and had to go begging the IMF to demand that a neighbouring central bank should purchase more or less of their "currency" just so their population could make ends meet.
You say that Germany wanted to "eliminate exchange rate risk for their European markets". While that may have been a handy bonus for Germany, it wasn't the agenda that created the Euro. That was simply one of globalism - where the US wanted to consolidate Europe into a firewall against the USSR and picked Germany as the seed since it was the primary subject of the post war "carve up".
Anyway, that's all politics.
The monetary lessons are: Don't integrate a store of value with a currency and don't integrate a payments system with either of the other two