I agree that it is not strictly necessary to make a safe mod like this, other ways could be found - such as the combination of gas vents and a low-pressure blowout plug that Rocketman suggested.
The problem is that this approach needs someone capable to design it; they have to be actually willing to do this for the right reasons; it can be (no, it will be) functionally destroyed by the corner-cutters; and buyers cannot see it to verify in the first place.
Gas vent slots are simple and some may not like them. Personally I love the idea because it is function combined with art. To me they look fine. But most importantly - they can't be wrecked by cost-cutting bodgers.