alt Hacker Newsit's also likely mildly more dangerous than a standard ebike, as ebikes typically overprovision their brakes. A customer putting this on a standard bike (especially a disc brake bike) might have less stopping power than they want on an ebike.
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I wouldn't worry about it in this application, because the added weight and power is so minimal. Also: many of the cheap ebikes ($1000-1500 range) have absolutely terrible, underprovisioned brakes.
The requirement for better brakes is more a myth. Yes an e-bike is heavier but the rider + bike pair is not significantly heavier so e-bikes don't really need better brakes as most of them aren't going significantly faster than regular "muscular bikes", especially the legal ones that have an assistance speed limit. Rider weight makes a much bigger difference yet bike brands don't insist on speccing more powerful brakes on bigger riders.
Why “especially a disc brake bike”? They’re the most reliable and resilient system so far, especially compared to rim brakes (V-brakes or cantilevers).