It does have support, but I've seen exactly one MIPS droid (a budget tablet called a 'Cruz' that had great battery life and terrible performance) and zero x86 a

It does have support, but I've seen exactly one MIPS droid (a budget tablet called a 'Cruz' that had great battery life and terrible performance) and zero x86 androids (other than ones I put together for myself from android-x86.org). So, I wouldn't say it needs to support these platforms. Just that not supporting them would be a glaring omission.