It's because something is better than nothing when it comes to software. Which people always forget.
Is eating spoiled food which gives you a disease better than not eating anything? No, it's worse, and therefore the minimum quality regulations make sense.
Is having low quality software better than not having any software? Yes, in almost all cases it is better. So a minimum quality regulation doesn't make sense.
When people put quality requirements too high on software, we get situations where for example public transport information and tickets aren't available digitally because the government is taking 15 or more years to make the "perfect" platform. The public is better served by a shitty solution the first years, an OK solution after that, and hopefully a good solution later on.
Delivering fast has a very important value when it comes to software, because you can replace it with improved versions at no physical cost. Delivering a vehicle which will kill you or food which will make you sick is very different. In those cases nothing is better than anything.