It's not remotely close to revoking citizenship. It's removing your permission to travel through other countries pursuant to treaties to recognize passports as official documents for specific purposes. It's used all the time when fugitives go abroad to trap them in a situation where they can be brought back for trial, usually after being detained for not having a valid passport. It does nothing on its own to remove your rights to vote, hold office, or anything else that citizens can do, and a nation can choose to ignore the lack of a passport if it so chooses. And in case you're thinking it limits the right to travel, nations have long held sovereignty over who crosses their border, whether entering or leaving, and that can include blocking its own citizens from leaving the country for any or no reason.