What makes paper wallets insecure?

Dull-Soup-2640
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I heard someone on this sub say paper wallets are insecure.

Why is this? What makes them insecure, and when bitcoin was just starting out, what choices did people have besides paper wallets?

If paper wallets were the best thing back then, and they are now seen as insecure by toadys standards, does that mean eventually, ledgers trezors and coldcards will be seen as insecure by future standards?