I know a.out support is routinely broken for fairly long stretches of time, and nobody notices.
We can still run binaries from 1991, *in theory*. The practice seems to be quite different.
IMHO we could probably drop all syscalls that were obsolete before the a.out->ELF transition without anyone noticing for a very long time indeed. (a.out support itself might be trickier to drop: is anyone still using it anywhere?)
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