String theory is cutting edge physics (or highly speculative depending on your point of view.) There are many in the scientific community who view it with suspicion because it has yet to make new testable predictions. That being said, string theorists realize that their theories have to be compatible with current theories and many string theories do make predictions that match those of QED, QCD, etc. This puts them way ahead of anything the the EU proponents have done have done with their "model". Most EU types seem to scorn the idea that their idea has to do anything like this, hence the scorn with which I, and other physicists view that idea.

For the purposes of the present discussion, however, string theories are a red herring. EU ideas (or at least the ones I've encountered here) seek to displace general relativity as a theory of gravity and view gravity as a manifestation of the EM force. Thus my challenge still remains. GR is the current, mainstream, theory of gravity. Any theory that seeks to replace it must do at least as well at matching observations. Binary pulsars are a classic example. When an EU model can match the data as well as GR does (as you can find in the link to the Nobel prize site I provided above) then maybe we can talk. Until then, the EU has no legs to stand on.

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"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind." - William Thompson, 1st Baron Lord Kelvin

"If it was so, it might be, and if it were so, it would be, but as it isn't, it ain't. That's logic!" - Tweedledee

This isn't right. This isn't even wrong. - Wolfgang Pauli