A marriage can be annulled if one partner is transitioning to another gender. The gov website then links to obtaining a GRC. I dont know if the annulment is only allowed if an application for a grc is made? If thats the case, the ability to obtain strong government issued id indefinitely, may trap religious women in marriages.
Men with female passports can use the trans helpline for DBS checks, as well as anything a passport is used for id. TRA are correct when they say getting a GRC is pointless bureaucracy, one of the few things that cannot be changed without a GRC is id with HMRC, most others can be.
It really is a loophole, even if its being going on for years.