Blow-by is usually caused by a bad PCV, oil overfilling, or poorly sealed engine. Whether its poor quality rings or excessive wear, it is the pressure in the crankcase that is the origin. Yes, oil weight and quality plays a role, but if an engine is already consuming oil or generally polluting the oil quickly, switching to a heavier weight / higher quality oil with more zddp is often not every effective. Kind of like a bandaid on the issue, the damage is already done. In many race engines they use a vacuum pump to eliminate this pressure and this is very effective, but also quite expensive. Another reason why catch-cans are a good idea because it separates acids, fuel, and other nasty byproducts from re-entering via the PCV.
I will say using high quality oil from the get go and not going excessive on the OCI is a great way to avoid the issue in the first place. Unless your PCV fails. Each engine is different and type of driving / length of drive cycle plays a major role. Korean engines are notorious vs Toyota and Honda for example.
