In theory, perfect levels of accuracy are good.
But then - in theory, theory and practice are the same. In practice, however... they often diverge.
In real life - the level accuracy has to be selected according to the need, not expected to be arbitrarily high or even perfect. Most of the time there is no need to be perfectly accurate (as a matter of fact, it is not even possible) and it is not desirable. Pretty much everything around you runs based on some approximation of accuracy, and the trick is not to make it more accurate but to pick the *appropriate* level of accuracy.
Same with teaching Go.
You simply cannot regurgitate all the details and intricacies of everything you know with 99% accuracy to a beginner or you will drawn him. Knowledge needs to be presented step-by-step, and accuracy increased over time.
For example:
You yourself say that "A beginner can use an easy approximation for 'important': 'many stones' or 'visually big'." - but this in itself is just an approximation with low accuracy, might as well say "defend all visually big groups" since this is what this translates to for a beginner. You seem to admit yourself that such loss of accuracy is needed, and apparently have no problem with that. And this is exactly what I am saying - such loss of accuracy is not only needed when teaching, but unavoidable, and with progress this accuracy gets refined.
The question is - what is the *appropriate* level of accuracy?
Personally, I like "Defend weak groups" better than "Defend weak and visually big groups" as you suggest. Both statements are not very accurate, although you might say that the latter is slightly more accurate. The difference is - the former statement needs to get eventually *refined* while the latter, more accurate one, needs to be *unlearned*. I hope you can appreciate the difference.
This is why "proverbs", which are nothing more but stepping stones to refined accuracy on the path of very low-level learning, are left not very accurate. And I think this is on purpose, backed by centuries of trial and error.
But go ahead, and prove me wrong.
RobertJasiek wrote: