So, with this understanding, could you explain why an electronic tether would not work for Solar orbits [used to get stuff from earth orbit distance and beyond to Venus and/or Mercury orbits?].

(BTW the right word is "electrodynamic" in this case, not "electronic" - minor quibble)

This is just guessing, but a Solar tether sounds viable in principle:

1) the Earth orbiting tether relies on the Earth's ionosphere to complete the electric current in the tether. I suppose a Solar orbiting tether could rely on the plasma Solar wind as an equivalent.

2) the system requires the magnetic field induced around the tether to drag against the the magnetic field of the Earth, for the tether to lose kinetic energy and fall to a lower orbit. Although the Sun's magnetic field does extend throughout the heliosphere (the size of the solar system), I don't know if its interplanetary component near the Earth and Venus, is strong enough to allow for an equivalent viable tether. Quite possibly?

3) The difference in the magnitude of Earth's gravitational field between one end of the tether and the other, helps to orient the tether in a vertical position (known as the tidal force). For a corresponding system in solar orbit, you would surely need a tether some thousands of kilometers in length, at least. But, while difficult to engineer, at least that does seem possible in principle.