This assumes user is the only person with physical access to unlocked phone.
All sorts of goverment agencies, airport security, even teachers now have access. And such attacks can be trivially automated, so even low paid worker can do it.
This is solvable by adding big huge warning that ADB is running. Not by removing feature.
That huge warning would also be permanently shown for everyone using Shinzuku apps. I think that UX would neither be desirable nor increase security.
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