def METHOD_NAME(user_agent_str: Optional[str]) -> bool:
    # In order to avoid users having a bad experience with these
    # custom profile fields disappearing after applying migration
    # 0421_migrate_pronouns_custom_profile_fields, we provide this
    # compatibility shim to show such custom profile fields as
    # SHORT_TEXT to older mobile app clients.
    #
    # TODO/compatibility(7.0): Because this is a relatively minor
    # detail, we can remove this compatibility hack once most users
    # have upgraded to a sufficiently new mobile client.
    if user_agent_str is None:
        return True
    user_agent = parse_user_agent(user_agent_str)
    if user_agent["name"] != "ZulipMobile":
        return True
    FIRST_VERSION_TO_SUPPORT_PRONOUNS_FIELD = "27.192"
    if version_lt(user_agent["version"], FIRST_VERSION_TO_SUPPORT_PRONOUNS_FIELD):
        return False
    return True