It isn't zeal, it's 15 years past hazy memory of getting different results on different executions in the same supercomputer. The story that went around was the one I relayed, but certainly your link does a better job explaining things that happen in the user perspective section:

https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/p37...

Summarized as,

> Most users cannot be expected to know all of the ways that their floating-point code is not reproducible.

Glad to know that the situation is defaulting to SSE2 nowadays though.