Given that lack of stack stability and overt slickness due to insufficent surface tension seriously affects the usage of a poker chip during play, it's a pretty major flaw..... and one that negatively decides the fate of plastic chips for many users.
Most people simply don't like chips that are harder than necessary to handle and count, do not stack solidly and are prone to easily falling over when barely touched or surroundings bumped, or act like exploding barrel projectiles when picked up in bulk.
Other undesireable issues that affect some plastic chips include suction effect (where chips stick together), and excessive weight when metal slugs are used (common even in many high-end plastics, in an attempt to counteract the inherent slickness).