> These are a current necessities, but nothing to sanctuarize for the future.

Although the ECB does not today "withdraw" notes in the sense that they cease to be valid for most purposes, it does deliberately destroy old notes and issue new ones with different images to replace them, so the original series must be getting pretty rare by now - not rare enough to be worth serious collectors paying money for it, but your ten year old may never have seen an actual old Euro €500 note even though in principle those still are valid money in the Eurozone.

That's exactly why they are a better choice, like the imaginary bridges on current Euro banknotes.

The selection of people is also quite poor but that's because people are a poor choice: Most notable historical people are very linked to specific countries, often against other countries so picking neutral ones is hard. They also clearly decided to have an equal number of men and women, which makes it even harder. Obviously there aren't enough different banknotes to represent every country, either.

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