This issue of OSAS is just like Catholic/Protestant debate on works.
Just as faith, without works is dead (so a Protestant believes works follows from faith and a Catholic might think works are necessary - but we end up in the same place - - so we should all live our lives as though OSAS is not true. A Protestant would say OSAS and those who intentionally sin (as oppossed to fall into sin and repent) were never saved - but the effect is those who are saved avoid sin and repent when they do sin. One who does not believe in OSAS would say we must repent from sin when we fall into sin else lose our salvation. We end up, once again, the same place

. Those who don’t repent were either never saved, or lose their salvation depending which side of the fence you are on the issue.
I do think that once we are touched by the Holy Spirit and born again, we will have an aversion to sin and desire to sincerely repent that did not exist before. Whether this rises to the level of OSAS, I don’t know.
Blessings,
Brian