That may, or may not, matter to your local law enforcement (depending on where you live and what your history is with local law enforcement).
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That means that law enforcement agents can claim that by the very nature of having the original client you "really want to do this". Perhaps it is better to have the special client so you can prove that you have no intention of storing or distributing such data.
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Perhaps. Either way, it will be MUCH SAFER for many people to have the special client as an OPTION that they can choose if they want to.
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But might be concerned about their safety and freedom if they run the original client, and therefore will not run any client at all.
Have not thought about this stuff. You are right, some stupid governments could really go against people who run full nodes with such an argument.
I just hope this will never happen.