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How do they handle the additional e-waste?

Additional in relation to what? Legacy systems need hardware and electricity too, people tend to forget this. I'd like to see the math on how much additional hardware is needed, if at all. My suspicion is that there's a lot of redundancy in the current infrastructure because each bank has to maintain their own record, given that they can't trust each other. A trustless and decentralized system, if it became the base layer for interbank payments, might actually reduce resource consumption.

Indeed. Trading floors. ATM networks. Primary and secondary data centres. Sky scapers in the financial district. Etc etc.

That shit all needs power too. For as long as that shit is actually needed.

And? Bitcoin is already consuming tons of energy while not being anywhere close to what our current system is doing

And not only in context of storing and sending money around.

There is still no fraud detection or account recovery or any other protection in place.

And all that while Bitcoin has not even a strategy on how you would be able to onboard everyone on the Blockchain fair and square. Everyone joining Bitcoin after someone else has less value.

No one will be dumb enough to start trading their fiat with crypto in the long run.

And clearly you don't know how banking works with your suspicion.

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