What part of trading miniscule transaction amounts for much larger value did you not understand?
The curve ball is that the value exchanged in non-fungible, i.e. isn't directly monetized. For example, paying 0.1 BTC per month to be able to publish your academic papers. The value enabled is much more than the value transferred monetarily. Now imagine blockchains open new markets of value which didn't exist before. Voila! Bitcoin destroyed. Watch it happen.
ah, so no one would want to save this money but just spend it!?
Afaics, that will not be correct. They only want to spend when they have some activity which is more valuable to spend it on, but those opportunities are not unbounded for each person, although multipied by our human population of 6+ billion the potential is IMO staggering. Sorry I can't really entirely elaborate the concept I have for the knowledge age entirely in this post. Afaics, the two concepts (investment/savings and spending) can co-exist, but not in Bitcoin because security would be destroyed with large blocks (because then whales can't replace the mining cartel when they need to ... this game theory was explained in the other thread).