I think the main issue is that testing is misused to create better version of something when it should be used to create knowledge. So if you do testing and it

I think the main issue is that testing is misused to create better version of something when it should be used to create knowledge. So if you do testing and it gives you some kind of result, the crucial step is trying to understand what it really means, is there something we can learn from it. Unfortunately, this is also the hard part that requires actual effort and intelligence and is difficult to scale -- and so is frequently skipped.