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Protobuf messages are serialized into a binary format rather than text like JSON, hence the messages in Protobuf are not at all human-readable. Due to binary nature Protobuf messages can be compressed and takes less space than an equivalent JS…
You can check out https://graphql.org/ for the full list of benefits.
The problem with object-oriented languages is they’ve got all this implicit environment that they carry around with them. You wanted a banana but what you got was a gorilla holding the banana and the entire jungle.