Does Thread give the correct answer to simplify the code?

Question

As multiprocessor and multicore computers are becoming more and more ubiquitous, are they just causing a new stream of (relatively) simple and painless way to simplify the code? For example, in my current personal project, I have a network server listening on a port. Since this is just a personal project, it is just a desktop application with an integrated graphical interface for customization. So, the application reads something like this:

Main ()
    Read configuration
    Start listener thread
    Run GUI

Listener thread
    While the app is running
        Wait for a new connection
        Run a client thread for the new connection

Client thread
    Write synchronously
    Read synchronously
    ad inifinitum, or till they disconnect

This approach means that although I have to worry a lot about blocking, with the potential problems associated with this, I avoid a lot of spaghetti code from asynchronous calls, etc.

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void WorkerThreadMain(Connection connection) {
    Request request = ReadRequest(connection);
    if(!request) return;
    Reply reply = ProcessRequest(request);
    if(!connection.isOpen) return;
    SendReply(reply, connection);
    connection.close();
}

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