The issue with the eMac is that its big, heavy, and prone to capacitor failure.
I don't know if the 1.42s suffered that issue, there's a specific "2005" revision of the 1.42, it seems.
Well, graphics program rendering is not "as native" as OS 9. Some games do not work in Classic Mode hypervisor/virtualiser, but do run well in OS 9.
Access to hardware is a separate issue than "native." There
is a differentiation between Classic Mode (which is ultimately a hypervisor doing virtualization) and booting directly on the hardware, but the code is still natively executing on the processor, and is not being emulated.