is there any specific use of setting transaction_read_only GUC externally?

Hi,
$SUBJECT,because anyway after the next transaction starts XactReadOnly is
going to change depending on either RecoveryInProgress()
or DefaultXactReadOnly GUC ,so if there's no specific use to
set transaction_read_only GUC can we change its GucContext from PGC_USERSET
to PGC_INTERNAL and remove check_transaction_read_only api which makes it
clear that we can't set it externally and only we can use SHOW on it,
thoughts?

-- 
Thanks,
Srinath Reddy Sadipiralla
EDB: https://www.enterprisedb.com/