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> similar to what the ACH does.

ACH transaction volume is about 840 transactions per second [1]. 100,000 anywhere-to-anywhere transactions per second while making sure no money goes missing and is not double-spent worldwide is NOT a simple problem, definitely not something you can just handwave away and then claim as a reasonable "guess".

[1] https://gocardless.com/en-us/guides/posts/ach-key-stats-fact...

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High throughout doesn't mean a high latency; one could process a million transactions per second or block and still need half an hour to verify (ie. reach global consensus on) the transactions within each block. Ideally ofc we'd have both, but if TPS was all that counted, the trade-off could likely be made (idk what I'm talking about).

"High throughout, low latency, or affordable fees: pick two."

Also it could well be broken into multiple rollups that mostly transaction within themselves, with more occasional transactions to and from the main chain or directly between rollups.

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