For most users, single sig is fine.
Backup seed words and use a passphrase.
At what point is it not fine?
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Companies. Rogue colleague cannot run off with the piggy bank.
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Hard to say, really, but everybody has to assess their own setup risk and come to their own conclusions.
I do think multisig for company treasuries etc. is an important feature, but for the average user it's overkill imo.
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