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> as far as not getting out, any lock unable to be unlocked from inside seems like something should not be allowed to be made. ever.

This would vary by jurisdiction, but locks without an unlock lever are usually prohibited by the fire code.

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interesting. my back door has a deadbolt requiring a key on both sides. ..it's an old house.

Why have you left it like that? Yeah it's against fire codes, but for a very good reason: it's incredibly unsafe.

My house still has a deadbolt like that, too. They were popular for a while, especially on doors with large glass panes (so that would-be intruders couldn’t smash the glass and unlock the door w/o a key).

Yet they exist, with a whole industry built around them

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