The choice is entirely yours to make. You're "supposed" to do what makes you happy. If you want countless pots of purple waffle plants, you could separate them, or you could propagate the stems to make more.
PW grows upward until it becomes heavy enough that the stem leans over and touches the ground, where each node takes root, forming a patch. In a pot, once a stem leans over the side of a pot, there is no soil in which it can take root, so it would have a trailing appearance.
Vine usually implies an ability to go up a tree or structure, which is not a quality of PW.
Having been purchased does not indicate anything about a plants need or not to be repotted. Some people always repot right away, some wait for a certain amount of time, some never do repot new plants, and some do it at the point when it seems to them that the plant would be happier/grow bigger/not dry so quickly/look better/provide something to do that day, if it was done. If there was just one approach that everyone used, and just one reason for doing or not doing a thing, we would have nothing to talk about.
(And it's Costa Farms, not Acosta Farms.) The houseplant company they bought is called Exotic Angel but it seems like they are trying to move away from that name, whether they actually are or not:
http://www.costafarms.com/coll...