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The default value of signResponses for this profile is "true", in keeping with modern best practice. As long as one of the response or assertion are signed, use of the profile is "safe" in terms of authentication integrity, but there are vulnerabilities in XML Encryption that make signing responses advisable when the most common encryption algorithms are used. Some of the backstory around the signing defaults is discussed in this thread.
The default value of encryptAssertions for this profile is "true".
If you encounter a relying party that accepts an unsigned response and assertion that is transmitted via POST (and not artifact), you have identified an insecure implementation and should report the issue immediately while following your local security incident response process.