The Twentieth Amendment reduced the "lame duck" period following elections in the US. Why didn't they eliminate the lame duck period completely? Why do new presidents still take office more than 2 months after being elected?

by EqualSky
voyeur324

/u/tim_mcdaniel has previously explained why it required an amendment to the US Constitution.

/u/dbht14 has previously explained the reasoning behind moving it to 20 January.

More detailed, precise answers would be welcome.