Indeed you are right, they are a tool to help a DM balance an encounter. In doing so, you have assessed and quantified, measured out the risk, to some extent reducing it because it is a known factor. But, what I’m saying is they’ve contributed to the cultural mindset shift in which many don’t actually want the risk as per the original post.
For example, wotc first introduced a detailed measuring tool in the 3e dmg, explaining to the novice DM what the tool was for. Interestingly, their early 3e modules didn’t follow these guidelines for many of the encounters. This led to quite a backlash from the community at the time.
The cart before the horse is here: they went from a tool useful to the DM to becoming an expectation of what should be encountered at play. Thus mitigating the potential risk.