But then they reach a certain point where that lack of deep understanding become a huge problem, and despite keeping the good work the scores lower.
Yes this!! Exactly this!!
Since I'm mostly working in tutoring, this is a huge issue because parents expect constant results if they're putting their kid in tutoring right? But the thing with most (Asian) parents is that they always want better and feels that learning is a linear process.
I have a student right now who had come from China just last year and was failing all her courses because she didn't know how to study and knew zero English. After tutoring her for a year she's now sitting at high 70s/80s on average. Which is super super amazing because she worked hard. But now her parents are like "if she can go from 50 to 80, why can't she go from 80 to 90?"
*Insert internal screaming here*
And then when I explain that now it's a more complicated matter of understanding and critical thinking and they're like "okay teach her that" and it's like sure but that'll take up to years, not the months you're thinking of...
I always have the habit of giving good news first then subtly inserting the bad news LOL it works well for some parents and not so well for others, like the case above. But for the case above giving bad news first also won't end well...