Linux Developers want to remove i486 & i586 Pentium CPU Support to unburden Kernel Developers.
Linux is renowned for supporting incredibly ancient hardware, but there are limits to even what Linux developers can support. “Linux developers are finally proposing removing support for ancient i486 and early i586 Pentium CPUs to unburden developers.”
https://www.phoronix.com/news/Linux-RFC-Remove-i486-Early-586