Tellegen's theorem is only mentioned in classic texts from ancient

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Tellegen's theorem is only mentioned in classic texts from ancient times, such as Linear and Nonlinear Circuits by L.O Chua. However modern colorful text don't mention it. but I read it's one of the most important network theories, so why it's not included in the net texts?
 

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Source : Wikipedia
Another extension is when the set of potential differences is from one network and the set of currents is from an entirely different network, so long as the two networks have the same topology (same incidence matrix) Tellegen's theorem remains true.

This part is an example of virtual work and can be further generalised.
 


Most people's level of circuit analysis doesn't require it so it doesn't get taught.

It's useful to know about if you are digging into, for example, how SPICE works or how to add a feature to SPICE. That tends to be graduate level EE fare.