Empty package downloads?

While updating the wiki I noticed the following regarding package downloads:
Some package architectures have...

  1. download available, but no device using this architecture
    https://lede-project.org/docs/instructionset/i386_i486
    https://lede-project.org/docs/instructionset/x86_64
    Is the ToH missing some devices?

  2. no download, but devices using it
    https://lede-project.org/docs/instructionset/mipsel_mips32r2
    Which architecture should be used for the devices listed in the ToH?

  3. no download, no device using it
    https://lede-project.org/docs/instructionset/mips64_mips64
    https://lede-project.org/docs/instructionset/mips64el_mips64
    What happened to them?