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If ethereum ever achieved adoption even close to a fraction of what stock trading has, then you'd have the same problems and overhead.

As it stands, the apples to apples comparison has any centralized, trusted network being more efficient than [attempted] trustless, proof of work like ethereum.

There are already a hundred different crypto exchanges (more than regular ones, possibly)

We do not count the people working on these exchanges as a part of crypto energy cost. So your argument is wrong, actually.

That's because you don't need the same scale of people to run a cryptocoin. It does it itself, more or less, with some maintainers. You can trade value with anyone anywhere in the world without all those banks and people. So in this case, it's an extremely important point.

etherium solves 0 of those problems so it’s a moot point