11.04 Installer allows Bootloader (Grub2) installation to Partitions, Why?

[YesWeCan]

It's not recommended, but it's not forbidden. It is a possible workaround option for those cases when you want some other OS installation to maintain control of the boot process.

So why doesn't it have a "no Grub install" option like OpenSUSE does rather than requiring it to be installed somewhere and allowing it to be installed to a partition?

[haresear]

So why doesn't it have a "no Grub install" option like OpenSUSE does rather than requiring it to be installed somewhere and allowing it to be installed to a partition?

I agree.