Serendipitously, I just tweeted about this 11 days ago: https://twitter.com/CyphrMe/status/1556660870901403648
"The moral is the need for cryptographic agility. It’s not enough to implement a single standard; it’s vital that our systems be able to easily swap in new algorithms when required."
Do you have a link to something that in your mind represents what Schneier is talking about?