What is so important about retaining the 64k ROM's anyway? Wouldn't the 128k ROM's provide more functionality and greater compatibility?

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I will let Mac128 answer you in detail on that point, as I have expressed my full opinion on that before in other threads on this site.

But I will summarize by saying this, if we all apply your thinking and cast the 64k ROMs to the wind, there is no meaning whatsoever in buying any Mac other than a Plus. Seriously. I personally am not drawn to a machine simply because its "the first Mac." Some software is incompatible with the new ROMs.

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You can retain the old motherboard and ROM's, I am not suggesting they should be discarded, but to say you want to keep it stock for the few pieces of software that won;t run with the newer ROM's (which would likely be impossible to find today, anyway) is like saying you refuse to upgrade from a G3 to an Intel Mac because the Intel Mac doesn't support classic and Leopard doesn't support G3 executable code. You're only hurting yourself because everything you are running on the G3 is obsolete and you will miss out on the later software that is available on newer machines. So what's the problem with putting a Plus motherboard in a 128 or 512k machine and putting the original board in storage to keep it safe? How much software are you realistically missing out on using without the 64k ROM's assuming you can even find it anymore?