486s and 586s are still sold for usage as embedded systems. They are well understood and some of them managed to pass certification decades ago.

You can still buy 32-bit Xeons, even. Sometimes srs bsns requires stability, too.

https://ark.intel.com/Search/FeatureFilter?productType=proce...

not to mention, 386 or not, there's still other 'odd' 32bit platforms which still have huge use for embedded things where openbsd would work great (hello mips/arm32, for starters)

There's a 32-bit x86 processor in every PC with the Intel Management Engine version 11 or later.