It can be easy to fall into the trap of things with capital letters, I think. By that I mean that we tend to establish a word, concept, or relation to something and hold on to those as immutable firm things. Things that don't change. This is my Relationship, this is my Personality, this is my powerlifting Technique. This is "How I get stronger", and so on. I think we like to think in these terms because, like a dictionary, you can just flip to that page again in your mind and see the term or concept there, just as you left it and feel a sense of internal consistency that I think we all try to keep.
In fact, I think we very much try to avoid inconsistency to the point of lying to ourselves at times. Anyway, I mainly just wanted to speak to the idea that change is natural, and should probably be expected more often. In powerlifting, we view technique with a capital T in at least two ways. One, that there is an archetype for a good squat, good bench press, and good deadlift. That you can have a list and check off certain attributes and arrive at "good" or "perfect". Second, that technique is also supposed to be the same across all loads and demands. My technique at 50% is the same as my technique at 80%, 85%, 90%, and so on. I think both of these are off, and we need to be more comfortable with change internally and externally.
The problems are that as a result of thinking of these things in constant, unchanging terms, we impose our ideas on others and impose them on ourselves, closing ourselves off from the option to think otherwise. Systems are messy. I think it's better to think of technique more like a quantum probabilistic map of finding an electron, for instance. "Here's where we are more likely to find good technique, and here's where we have a 95% confidence interval of finding great technique. Here, great technique is nearly certain to be found." But just knowing that it's less certain, that there are multiple parameters and individual differences, and that there are differences between loads, reps, etc. And that's okay.