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"Also, there won't be security updates for old releases which is bad" - for a FOSS OS like Ubuntu, "no OEM-provided security updates" ≠ "no security updates".
@Nmath: "Otherwise, there will be no community supported versions of Ubuntu for 32-bit only hardware once 18.04 reaches end of support" - Only if we decide for some reason that Canonical no longer officially supporting 18.04 somehow means that we have to stop providing community support for it. "Why should we provide community support on an operating system that doesn't get security updates?" - The beauty of having a FOSS operating system is that you can write your own security updates (or ask someone more-technically-inclined to do so), even if the original vendor won't anymore.
@ThomasWard (first comment): "Once a release goes into ESM it is beyond the purview of community support" - Nothing is ever beyond the purview of community support. Just because Canonical wants to EOL something doesn't mean we have to stop helping users who can't upgrade for some reason.
Another reason for allowing questions specific to EOL releases: some people can't upgrade, for whatever reason (for instance, someone with a pre-G5 Power Mac won't be able to upgrade to anything past 16.04/16.10, as 17.04 and newer lack PPC32 support), and need to make do with the EOL version they have.
"if I can't get security updates for things, why am I using this?" Maybe someone can't upgrade to a supported version (e.g., fatal hardware incompatibilities)?
