Enforcing system crypto policies

[Frank Ueberschar]

Here 
https://docs.fedoraproject.org/en-US/packaging-guidelines/CryptoPolicies/ 
is a proposal to use a specific cipher list string for 
SSL_CTX_set_cipher_list(): "PROFILE=SYSTEM".

Especially this citation: "if that call is present and provided a fixed 
string which does not contain PSK or SRP, replace the string with 
"PROFILE=SYSTEM", or remove the call"

We have to rely on PSK. What ist the reason behind the above advice?

Thanks, Frank