The WTS seems to have become far more restrictive on their marriage rules than they were back in the day when I was still attending (40+ years ago).
In the congregation I attended, it was not uncommon for JW young people to date 'wordly' people. However, the practice was not encouraged, and if someone was seeing someone 'in the world', the focus was on getting them to convert their prospective partner.
In the late 60s, the head honcho elder's daughter dated an RCMP officer for a length of time before she announced their intention to marry. Her super duper zealous father went into high gear, put the poor fellow through his baptism paces in record time, and then drove several hours to some location obscure location to get him dunked the week before they got married. We all got to see the groom walk down the aisle of the Kingdom Hall in the Queen's red serge uniform.