The MITM proxy feature is comparable to Charles, mitmproxy and others. Typically, in software like OWASP ZAP, Burp Suite (and now Hetty) the MITM proxy is only

The MITM proxy feature is comparable to Charles, mitmproxy and others. Typically, in software like OWASP ZAP, Burp Suite (and now Hetty) the MITM proxy is only part of a larger set of features for doing research. E.g. the proxy is used initially for discovery of endpoints, and then the results are used for manual/automated requests/attacks on a service. Hetty doesn't have these features yet, but OWASP ZAP and Burp Proxy do.