We’ve seen several strongly worded claims here that delaying bathroom trips can have serious consequences, but I’ve never seen a reputable scientific article that supports such a position. I’d be happy to read something that’s based on evidence. Without that supporting information we may be veering into either personal experience that’s being generalized in an exaggerated way, or (worse) overconfidence in unfounded speculation.
When your doctor gives you advice it is often highly specific to your particular situation. It’s often helpful to share that experience here, but it’s rarely helpful to assume (or insist) that advice applies equally well to everyone.