It’s not going to be an issue unless you have to visit immig for an extension for example, or you end up in Hospital and they can’t track down where you are staying to contact relatives or friends…..
It’s not discretionary - the system flags it during check in if you are on a one way ticket why take the risk of being bumped get an onward flight to be safe, you can always cancel it
agents feed corruption and support thousands who do not or cannot comply with Visa requirements ie 800k or 65k a month the day of reckoning beckons and many may end up being exposed when this web of corruption implodes as it one day, will……for single guys no issue but folks with families have to take a more reasoned approach.